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044 How Blood Flows Through the Heart

How does the blood move around the body? What is the role of the heart in bringing blood to all the different parts of the body?

Watch and see as Leslie gives an overview of the Circulatory System, the first in this series. Enjoy!

Transcript of Today’s Episode

Hello and welcome to another episode of Interactive Biology TV where we’re making Biology fun! My name is Leslie Samuel and in this episode, Episode 44, I am going to be talking about how blood flows through the heart. This is going to be the first video in the Circulatory System series. So, let’s get right into it. Here, we are looking at two pictures of the heart. On your left, we’re looking at the heart when it’s being filled with blood. On the right, we’re looking at the heart when it’s pumping the blood out of the heart. We’re going to look at a number of details here just to give an overview of how the blood flows through the heart. In order to understand how the blood flows through the heart, we need to look at the valves that are found in the different parts of the heart. First of all, allow me to point out that this is the right side of the heart so, this is right. Over here, we have the left side of the heart. Now, that looks a little strange because when you’re looking at the screen, this is your left and this is your right. But, this is looking at it as an individual that’s facing you. This would be his right side and this would be the left side. There are a number of valves that are found throughout the heart. There are a number of parts of the heart that we need to know. The first thing I want to point out is here, we have the right atrium and the left atrium. So, this chamber is the left atrium. This chamber is the right atrium. Then, we have the right ventricle and the left ventricle. Same thing over here, we have the right ventricle, left ventricle; right atrium and left atrium. The next thing I want to point out is that between the atria and the ventricles, we have what we call the atrioventricular valve. And that makes sense since it’s between the atria and the ventricle. So, here we have an atrioventricular valve, here we have an atrioventricular valve. Now, on the right side, we also call this atrioventricular valve a tricuspid valve. We call it “tricuspid” because it has three cusps, in other words, three flaps. You’re only seeing two here but, that’s because this is a cross-section. Then, on the left side, we have what we call the left atrioventricular valve which is also known as the mitral valve or the bicuspid valve. I’m just giving you these different names so that if you go and read a textbook and it says one of these, you know exactly what it’s talking about. So, we have the tricuspid or the right atrioventricular valve and the bicuspid or the mitral or the left atrioventricular valve. Then, we have valves that allow blood to leave the ventricles. On the right side, we have the right semilunar valve and that is also called the pulmonary valve. The reason it’s called a pulmonary valve is because it leads into the pulmonary artery. On the left, we have this semilunar valve which we can also call the aortic valve. We call it the aortic valve because it leads into the aorta. So, these are the different names and I want you to know these names: tricuspid, bicuspid, mitral, atrioventricular, aortic, semilunar, which is the pulmonary and the aortic. Those are the valves that I want you to be familiar with. The special thing about valves is that it allows for blood to flow in one direction. So, here you can see blood can flow into the ventricle but, it can’t flow back. If it tries to flow back, these valves are going to shut. So, all of these valves are one-way valves. They allow for blood to flow in one direction. Now that we know the different valves, let’s look at how blood flow happens. Blood comes back from the body and it enters into the heart via the vena cava. So, you can see blood is flowing into the vena cava. We have the posterior vena cava and we have the anterior vena cava. Blood is coming in, entering into the right atrium. As it enters into the right atrium, the atrium contracts and that pushes the blood into the right ventricle. Once the blood gets into the right ventricle, the ventricle contracts and that pushes the blood through the semilunar valve or the pulmonary valve into the pulmonary artery. And from here, that blood goes to the lungs. And, it goes also in this direction to the lungs. Once the blood goes to the lungs, it picks up, you guessed it, oxygen because you’re breathing in the oxygen. That oxygen aids the blood. Once the blood gets oxygen aided, it leaves the lungs and goes via the pulmonary veins into the left atrium. The left atrium contracts sending the blood through the left atrioventricular valve into the left ventricle. Once the blood is in the left ventricle, the left ventricle contracts and that sends the blood through the semilunar valve or the aortic valve in this case, into the aorta, and then, that blood can go to the rest of the body. I know this looks a little confusing with all of these arrows but, let’s follow that one more time. Blood comes from the body. It enters via the posterior and anterior vena cava into the right atrium. The right atrium contracts and that pushes the blood through the tricuspid valve or the right atrioventricular valve into the ventricle. The ventricle contracts and that pushes the blood via the semilunar valve or the pulmonary valve to the pulmonary arteries that go to the lungs, picks up oxygen, then it comes back oxygenated via the pulmonary veins into the left atrium. The left atrium contracts and that pushes the blood into the left ventricle. The ventricle contracts, pushing the blood via the aortic valve or the semilunar valve to the aorta and out to the rest of the body. So, the function of the heart is basically to pump the blood to the body, to send the blood to the lungs to pick up oxygen, and then to send that oxygenated blood to the muscles and to the organs that need it. Once the muscles and the organs that need it, once they use that oxygen, the blood comes back via the vena cava to the heart. The process can continue over and over again. I have these two over here and you can see, this shows the heart filling with blood and, this shows when the ventricles actually contract and send the blood out to the lungs and to the rest of the body via the aorta. There’s one thing I’d like to emphasize though. I say that, first the right atrium contracts and then the right ventricle contracts, and I’m saying that just because I’m showing it one at a time. But, both atria contracts simultaneously and both ventricles contract simultaneously. So, that while this process is happening, this process is also happening. Blood is being pumped to the lungs. At the same time, it’s being pumped to the rest of the body. That gives you a general introduction into the circulatory system by showing you how the heart pumps blood. As usual, you can visit the website at Interactive-Biology.com for more Biology videos and other resources. That’s all for this video, my name is Leslie Samuel and I’ll see you on the next one.

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Leslie Samuel is the creator of Interactive Biology. His mission is to use this site to Make Biology fun for people all over the world.

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Leave An AWESOME Comment

527 Responses to “044 How Blood Flows Through the Heart”

  1. Lisa May 8, 2011 at 3:28 pm #

    Great site! Thank you! :)

    • Lrsamuel May 9, 2011 at 1:28 pm #

      You are very much welcome Lisa :)

  2. Shrikharan May 16, 2011 at 12:23 pm #

    Thanks Leslie for your videos. There are very good teaching material. I am a doctor from Sri Lanka. I am responding to the question on terminology raised by Livinglifehigh as to whether it is correct to call them posterior and anterior vena cava or Inferior and superior vena cava.

    In man, they are called Inferior and superior vena cava as man is biped and when standing upright it is inferior and superior in its orientation to the heart.

    However, I can imagine you being a biologist and all animals are mainly quadruped the ‘superior vena cava’ becomes ‘anterior vena cava’ and ‘Inferior vena cava’ becomes ‘posterior vena cava’. This is my guess why you call it so. So I think both terminologies are acceptable.

    • Lrsamuel May 16, 2011 at 3:47 pm #

      Heyy, thank you so much for your input. I really appreciate it. The more people chime in, the better!

  3. Post grad teacher September 12, 2011 at 9:30 am #

    There seems to be a problem downloading the video for 044 How Blood Flows Through the Heart, it says I need a password, other videos have downloaded Ok – Great site though

    • Lrsamuel September 12, 2011 at 12:08 pm #

      Thanks for pointing that out. I’ve fixed the download link.

      All the best!

  4. InteractiveBiology November 9, 2011 at 12:27 pm #

    @shawnagh You’re very much welcome. We’re happy to know that we were able to clarify things for you. Stay tuned, because we have more videos coming!

  5. shanaspeck November 16, 2011 at 10:54 pm #

    I am so glad I found this video. We are studying Cardiovascular system in A & P now and I just could not grasp the flow, but now I totally understand.

  6. InteractiveBiology November 17, 2011 at 6:16 am #

    @shanaspeck Leslie explains them as simply as he can for everyone to understand. You can visit our website for more cardiovascular system videos. I’m sure you’ll find value in each of them. Thank you for watching and stay tuned for more! :)

  7. ChibiNyaaX3 November 20, 2011 at 10:02 pm #

    This video saved me! I have. Test on this tomorrow and I didn’t understand the way the book made it out. After watching this I get it a lot better!! Thank you soooo much!

  8. InteractiveBiology November 21, 2011 at 7:12 am #

    @ChibiNyaaX3 Glad you’re finding value in our videos. Thank you for watching! Please stay tuned for more Biology videos coming soon!

  9. issayk1 November 23, 2011 at 8:47 pm #

    In The name of God
    Hello
    Thanks for your video
    very useful for more education
    but i have wrong in this video
    in picture worte anterior and posterior vena cava but it’s wrong
    there are superior and inferior vena cava

    Thanks for your video

    Islam is my way until beyond
    God’s my trust
    God keep’s me

  10. issayk1 November 23, 2011 at 8:48 pm #

    In The name of God
    Hello
    Thanks for your video
    very useful for more education
    but it’s wrong in this video
    in picture worte anterior and posterior vena cava but it’s wrong
    there are superior and inferior vena cava

    Thanks for your video

    Islam is my way until beyond
    God’s my trust
    God keep’s me

  11. InteractiveBiology November 23, 2011 at 9:30 pm #

    @issayk1 Hi! Thank you for watching. Yes, we had the discussion on the error below in the earlier comments posted. You can go ahead and check them out.

    Please stay tuned for more Biology videos :)

  12. XSymphony November 24, 2011 at 2:13 pm #

    Hello, one quick observation… 4::54…. Posterior and Anterior vena cava.
    I think it’s Superior (Anterior) and Inferior (Posterior). I’m from Romania… and we studied them like that…. and I’ve seen pretty much videos (USA made) which say the same thing :) (superior – inferior)

    Anterior = in front of. Posterior = behind.
    They have the same position, only one collects no oxigen blood from superior members + head, and the other one from the down below body.

    Keep up the good work

  13. InteractiveBiology November 24, 2011 at 4:22 pm #

    @XSymphony Yes, this error was already discussed. Please refer to the previous comments below. Thank you! :)

  14. XSymphony November 24, 2011 at 5:24 pm #

    @InteractiveBiology sorry, my bad, didn’t checked all comments.

  15. InteractiveBiology November 25, 2011 at 2:09 am #

    @XSymphony Not a problem :)

  16. FLUFFYburito November 30, 2011 at 9:44 pm #

    i have i science test on this tomorrow, this helped a lot

  17. FLUFFYburito November 30, 2011 at 9:44 pm #

    i have i science test on this tomorrow, this helped a lot

  18. InteractiveBiology December 1, 2011 at 5:35 am #

    @FLUFFYburito Great! Hope you ace your test. Good luck! :)

  19. sylverteaz December 1, 2011 at 1:27 pm #

    I have an anatomy test on Monday and this helped me – it was easy to follow and a clear demonstration! Thanks for posting.

  20. sylverteaz December 1, 2011 at 1:28 pm #

    @issayk – they can be reffered to as anterior/superior/cranial and posterior/inferior/caudal, interchangeably. They are all correct…

  21. InteractiveBiology December 1, 2011 at 7:24 pm #

    @sylverteaz You’re welcome! Glad to know this helped. Stay tuned for more Biology videos :)

  22. lemonmasherboi December 5, 2011 at 11:54 am #

    great vid thanks alot really heped me with my biology exam thumbs up :)

  23. raiamirr December 5, 2011 at 9:36 pm #

    it really helps. Great Video..!

  24. InteractiveBiology December 6, 2011 at 9:55 am #

    @raiamirr Thank you! :)

  25. InteractiveBiology December 6, 2011 at 9:56 am #

    @lemonmasherboi That’s great! Stay tuned, we have more Biology videos coming very soon!

  26. norcoboy December 7, 2011 at 2:27 am #

    Thank you for posting Leslie. You are truly an inspiration.

  27. InteractiveBiology December 8, 2011 at 9:37 am #

    @norcoboy Leslie’s inspiration are actually his viewers. You are his reason why he wants to keep on doing what he’s doing at his Biology website. Stay tuned. He has more videos coming very soon!

  28. CamelliaASultan December 10, 2011 at 9:00 pm #

    thanks alooooot u r amazing

  29. InteractiveBiology December 11, 2011 at 1:19 am #

    @CamelliaASultan You’re welcome! Please stay tuned. We have more Biology videos coming soon! :) Have fun learning Biology!

  30. sheilayoyo December 18, 2011 at 5:25 pm #

    LOVE THIS CHANNEL ;) SO HELPFULL

  31. InteractiveBiology December 18, 2011 at 5:36 pm #

    @sheilayoyo Thank you! We’re glad to be of help. Please stay tuned as Leslie will be making more Biology videos for the site. Thank you! :)

  32. Dipsy260495 December 21, 2011 at 12:46 pm #

    if you can , please may you make a video on plants as in plant transport system , (xylem and phloem)…

  33. InteractiveBiology December 21, 2011 at 1:52 pm #

    @Dipsy260495 Hi, unfortunately, Leslie is no longer taking requests for specific videos. He’s loaded with a lot of work that it would already be impossible for him to do all requests. But, nevertheless, we hope you’ll still find the site helpful. Good luck with your studies!

  34. adamski03able December 23, 2011 at 1:03 am #

    O my, very interesting. Thx Leslie you made it very easy to understand. Keep up the good job. Thumbs up

  35. InteractiveBiology December 23, 2011 at 12:21 pm #

    @adamski03able Glad to know you found value in them. Please stay tuned! We have more Biology videos coming soon! :)

  36. tokohgraduan2009 December 27, 2011 at 6:01 pm #

    hello leslie could you make explaination on smooth muscle’s contraction mechanism please?
    i dont understand about the calmadulin-calcium complex,myosin light chain kinase,myosin light chain phosphatase and the latch bridge.thanks a lot anyway.

  37. TheHeartmedia January 2, 2012 at 1:31 am #

    tx for the upload, keep up the good work, knowledge for all!

  38. ABL36 January 5, 2012 at 8:37 am #

    Is this guy from reading rainbow?

  39. Pherawax January 17, 2012 at 5:27 pm #

    Good video. Easier to follow than most

  40. lozlo13 January 18, 2012 at 11:26 am #

    Thank you for explaining this in a fun and easy way :) cheers mate

  41. lozlo13 January 18, 2012 at 11:26 am #

    Thank you for explaining this in a fun and easy way :) cheers mate

  42. ohcecilia228 January 24, 2012 at 9:37 am #

    Great video, you did a great job!

  43. okay859 February 1, 2012 at 8:05 pm #

    i wish you were my teacher! :)

  44. zamus2004 February 5, 2012 at 1:24 am #

    This is so awsome i actually understood everything thank you!! Great video 2 thumbs up! :)

  45. anserhasan February 5, 2012 at 12:12 pm #

    id like to know how when the papillary muscles contract which also makes the chordae tendinae pull back and taking notice that the tricuspid valve is connected to the chordae tendinae do the valves open or do they close when the papillary muscles contract along with the chordae tendinae and during when the atria contracts.

  46. anserhasan February 5, 2012 at 12:12 pm #

    id like to know how when the papillary muscles contract which also makes the chordae tendinae pull back and taking notice that the tricuspid valve is connected to the chordae tendinae do the valves open or do they close when the papillary muscles contract along with the chordae tendinae and during when the atria contracts.

  47. anserhasan February 5, 2012 at 12:15 pm #

    oh and you might have to correct the decription of the vena cava its superior and inferior not anterior and posterior. But it was a great video for clearing my understanding of blood circulation but im confused what relationship do the papillary muscles have when the atria is contracting or not and how it affects the valves.

  48. lomographylillian February 6, 2012 at 6:32 pm #

    So incredibly helpful, you are such a blessing!!

  49. lunita01co1 February 6, 2012 at 10:36 pm #

    I loveeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee this guy he makes all this topics very simple !!!!!!!!thank you for you help

  50. fleetwoodfan12 February 14, 2012 at 12:14 pm #

    I wish you could get my tuition instead of my physio prof…

  51. cutiepierubs February 16, 2012 at 3:20 am #

    very well-done!

  52. milandou01 February 18, 2012 at 7:59 am #

    Now,I understand my lecture from yesterday.. Thanks you so much.

  53. 0neinamilli0n February 19, 2012 at 1:05 am #

    that was an excellent easy description! THank you so much! :)

  54. doubleg35 February 19, 2012 at 8:51 pm #

    Thanks to people as yourself, I can better understand this material. Thank you for the time and effort and the good explanations!

  55. Angela Lawlor February 19, 2012 at 6:00 pm #

    Thank you so much!! I was having a hard time getting this from a textbook and audio from an online class. I love your videos and wish I had a teacher like you when I was in school before!

    • Leslie Samuel February 21, 2012 at 10:49 pm #

      Hi Angela,

      So glad to know that the videos are helping you. Stay tuned for more :)

  56. 7akkoyeb February 24, 2012 at 11:49 am #

    Thanks for letting it all make sense thanks so much

  57. jonez444 February 26, 2012 at 6:18 pm #

    My teacher took 2 and a half weeks to explain that but she failed miserablery, and you did that in 9 minutes. thankyou so much

  58. joanna5237 February 26, 2012 at 11:46 pm #

    Wow should of saw this before I got a D :( …now gonna retake it for sure imma get an A …thank you I get everything so much better because of you :D yay!!

  59. ChocolateFaggot February 27, 2012 at 2:07 pm #

    Great video!

  60. experience271 February 29, 2012 at 4:02 pm #

    @Dipsy260495 xylem transports water. Phloem transports sugars and other ions. Each structure has specific adaptive features that allows it to carry out its function. Water is transported using hydro-static pressure gradient across plant. Sucrose enters the plant using active transport. Google for more info…

  61. experience271 February 29, 2012 at 4:02 pm #

    xylem transports water. Phloem transports sugars and other ions. Each structure has specific adaptive features that allows it to carry out its function. Water is transported using hydro-static pressure gradient across plant. Sucrose enters the plant using active transport. Google for more info…

  62. Livia S. March 3, 2012 at 10:27 am #

    That was so EASY to understand… Thank you so much! Now I think I can describe the path of blood through the heart with my eyes closed!

  63. ProfRoofs March 8, 2012 at 6:33 pm #

    Want to learn an very EASY way to understand blood flow??? This is a great video! However, I suggest searching in YouTube for “Blood Flow Made Easy” and I guarantee you will get every exam question right! Then come back to this video and you will understand it better.

  64. MultiCanab March 12, 2012 at 5:45 am #

    OMG thank you sooooo much Leslie! this video was very useful and i honestly learnt so much from this video than my teacher!

  65. INWOF March 16, 2012 at 1:42 am #

    thank u soo much very informative. i will be doing a university presentation coming the human heart to a racehorse’s heart

  66. INWOF March 16, 2012 at 1:42 am #

    thank u soo much very informative. i will be doing a university presentation coming the human heart to a racehorse’s heart

  67. bmery44 March 19, 2012 at 2:47 am #

    woww AWESOME!!!

  68. rjp172 March 19, 2012 at 6:32 pm #

    This may be the single best resource I’ve run across.

  69. rjp172 March 19, 2012 at 6:32 pm #

    This may be the single best resource I’ve run across.

  70. mrjekale1 March 19, 2012 at 6:37 pm #

    Wow, you are such a great teacher! You really make biology fun.

  71. chrisprak88 March 21, 2012 at 1:45 pm #

    this is GREAT AMAZING HOW much LEARNING IS BETTER on YOUTUBE THEN INPERSON… THANKS ALOT. KEEP UP THE OUTSTANDING VIDEOS

  72. yokie40 March 22, 2012 at 11:48 am #

    great video, it explains it very well than my anatomy book. Hope i get an A on this test.

  73. yokie40 March 22, 2012 at 11:48 am #

    great video, it explains it very well than my anatomy book. Hope i get an A on this test.

  74. alyssapx22 March 26, 2012 at 7:08 pm #

    Thank you this really helped me. I have an anatomy practical tomorrow.

  75. aprilblackwood March 27, 2012 at 7:58 pm #

    You are such a gem! I have a lab exam coming up and this was such a help. I wish you were my professor!

  76. ELFKIN100 March 28, 2012 at 9:41 pm #

    You are Wonderful , thank God for you :) !!!!

  77. ELFKIN100 March 28, 2012 at 9:41 pm #

    You are Wonderful , thank God for you :) !!!!

  78. SammyBambii March 30, 2012 at 12:57 am #

    THANKS!

  79. MrHenryandmichelle April 2, 2012 at 9:54 pm #

    AWESOME!!! THANK YOU SO MUCH!!

  80. MrHenryandmichelle April 2, 2012 at 9:54 pm #

    AWESOME!!! THANK YOU SO MUCH!!

  81. gina rimbey April 3, 2012 at 2:13 pm #

    Finally, I understand how blood flows through the heart. You are a superb professor of biology and a brilliant instructor!

  82. Anonymous April 3, 2012 at 6:13 pm #

    Finally, I understand how blood flows through the heart. You are a superb professor of biology and a brilliant instructor!

  83. BenevolentBrute April 4, 2012 at 8:53 pm #

    very heartwarming

  84. BenevolentBrute April 4, 2012 at 8:53 pm #

    very heartwarming

  85. Scoffstache April 9, 2012 at 12:37 am #

    good review. my txt book is terrible compared to this

  86. Scoffstache April 9, 2012 at 12:37 am #

    good review. my txt book is terrible compared to this

  87. MoonWitchRuuRuu April 9, 2012 at 5:37 pm #

    Thank you so much, this really helped me!

  88. guillerod81 April 9, 2012 at 11:48 pm #

    Probably the most well explained video. thank you.

  89. guillerod81 April 9, 2012 at 11:48 pm #

    Probably the most well explained video. thank you.

  90. Nooni863 April 16, 2012 at 1:32 pm #

    Thank you! You really saved my grade! :D

  91. arnettejm April 18, 2012 at 8:30 pm #

    I can’t thank you enough for making this video as elementary as possible. I just watched another video on the same topic and it left my head spinning. I’m sure to ace my exam now. Thanks a million!!!

  92. digiconvalley April 21, 2012 at 7:59 pm #

    this has always been my fav topic

  93. digiconvalley April 21, 2012 at 7:59 pm #

    thank you sir

  94. alixalman April 23, 2012 at 2:45 pm #

    “pulmonary vein to the lungs,” dude get your anatomy straight.. pulmonary artery takes blood to lungs and vein takes it away from lungs

  95. engiesoto April 24, 2012 at 7:52 pm #

    very helpful!!!

  96. jdillla93 April 25, 2012 at 4:49 am #

    I just wanna say you’re amazing. You start basically from scratch. My textbook used so much jargon that it did’nt click in my head & other videos demonstrated asif we knew some knowledge. Thank you thank you thank you !

  97. MsMilkmaid April 25, 2012 at 4:03 pm #

    Genuinely… thank you :)

  98. MsMilkmaid April 25, 2012 at 4:03 pm #

    Genuinely… thank you :)

  99. mara danni April 25, 2012 at 9:26 pm #

    i just want to say thank you so much i missed this topic in lab class and i really needed to understand the heart my friends explaining it was so confusing but i finally get it im so happy !!

  100. Anonymous April 26, 2012 at 1:26 am #

    i just want to say thank you so much i missed this topic in lab class and i really needed to understand the heart my friends explaining it was so confusing but i finally get it im so happy !!

  101. Isabellesweeps April 29, 2012 at 7:21 pm #

    I have been struggling all week trying to understand the heart flow. Your video made it simple for me to understand. I also enjoyed your relaxed pace, soothing voice (lol), and teaching methods.

  102. athisulu777 May 2, 2012 at 10:34 pm #

    i was trying to get my head around the cardiac system , i tried it many times never worked. this video just made it so easy to understand and to learn. thank you very much

  103. trustar99 May 2, 2012 at 11:36 pm #

    whoa this really helped! thanks a lot!

  104. PinkElephant5894 May 6, 2012 at 3:36 am #

    this was AMAZING! thank you so much!

  105. Fishtastic4 May 8, 2012 at 1:45 am #

    Absolutely fantastic! You are a amazing teacher! Thank you :) xxxx

  106. Shmayface May 8, 2012 at 6:47 pm #

    Thank – you so much! This REALLY helped me, let’s hope my Biology exams next week ask me a big question about the heart :D

  107. nizhonigirl66 May 8, 2012 at 11:10 pm #

    Soooooooooo helpful having a test on this and it helped thanks so much :D

  108. MYSTIQUE5044 May 9, 2012 at 5:17 pm #

    very good video! thanks!

  109. RajzUTube7 May 11, 2012 at 2:10 pm #

    thanks for the video. was a great explanation. nb. incorrect spelling: antrioventricular

  110. calicalient3 May 12, 2012 at 3:52 pm #

    EXCELLENT! THANK YOU

  111. calicalient3 May 12, 2012 at 3:52 pm #

    EXCELLENT! THANK YOU

  112. bikenbabby May 12, 2012 at 11:09 pm #

    Thank you…this was so easy to follow…I enjoyed it a great deal.

  113. Amanda Worth May 13, 2012 at 4:14 pm #

    absolutely brilliant – wow you have made this really easy to understand im happy to do my placement on CCU now, thank you

  114. squashlover98 May 13, 2012 at 9:37 pm #

    My science teacher should have showed this to us! I would have failed the exam without this video! Thanks!

  115. DeathDoily May 15, 2012 at 4:38 am #

    Thank you. Thank you so much.

  116. MED7235 May 16, 2012 at 11:40 am #

    Thumbs up !!

  117. elleine lusung May 17, 2012 at 8:36 am #

    you made it easy to understand. thanks

  118. hannahl1228 May 17, 2012 at 10:34 pm #

    i love you

  119. scaler27 May 19, 2012 at 12:42 pm #

    I quit smoking with Campral….Watch my youtube video Campral

  120. mattwendieliemma May 20, 2012 at 2:56 am #

    You are a gifted teacher. Thank you for sharing your God given talent with us!

  121. mosolesa pesaleli May 20, 2012 at 6:25 am #

    pleasee, really helpful . thanks

  122. beckycoull May 22, 2012 at 11:42 am #

    I have a biology exam tomorrow and you have literally just saved my life! Thank you, very helpful.

  123. djfx9000 May 27, 2012 at 9:04 pm #

    1900 gallons of blood pumped every day by heart; funny how they never mention it.

  124. lupinettes May 28, 2012 at 6:06 pm #

    This is the best. I now know how the blood goes through my heart. You cleared my confusion. :D

  125. MatthewR24 May 29, 2012 at 2:27 am #

    Thanks a lot. Appreciate it.

  126. TheDonald124 May 29, 2012 at 11:26 am #

    thanks alot. amazing explanation. slow and easy. :)

  127. MrBleather May 31, 2012 at 8:43 am #

    Great Video. Just thought I would let you know that in your brief written description you said “It shows blood entering via the vena cave to the Right atrium, then getting pumped into the right ventricle, to the pulmonary vein to the lungs” Shouldn’t it be the pulmonary Artery?

  128. GarciaAllyrianne May 31, 2012 at 10:33 am #

    Great Video! At least now I understood the whole process and the function of each part of the heart! I am totally gonna survive 6th Grade! Except for the Algebra…I really, really appreciate you for making this video for us student to understand the lecture well. Keep posting more videos! We will surely gonna subscribe you! :D

  129. TheJavaria May 31, 2012 at 4:07 pm #

    Thanks ever such alot!!! your video is so helpful..

  130. Devyn Hepworth June 3, 2012 at 6:11 am #

    Yes. It should be pulmonary artery!

  131. candycane0710 June 4, 2012 at 2:48 am #

    thanks heaps! helped me alot! ur great! :D

  132. candycane0710 June 4, 2012 at 2:48 am #

    thanks heaps! helped me alot! ur great! :D

  133. Bubbles777ify June 5, 2012 at 7:30 pm #

    Great video

  134. Bubbles777ify June 5, 2012 at 7:30 pm #

    Great video

  135. Bubbles777ify June 5, 2012 at 7:30 pm #

    Great video

  136. Katnissfire June 6, 2012 at 12:57 am #

    Don’t forget it’s over 60,000 miles!

  137. Katnissfire June 6, 2012 at 12:57 am #

    Don’t forget it’s over 60,000 miles!

  138. HollandUnited June 6, 2012 at 1:26 am #

    thumbs up if this saved you and you dont like your teacher

  139. HollandUnited June 6, 2012 at 1:26 am #

    thumbs up if this saved you and you dont like your teacher

  140. HollandUnited June 6, 2012 at 1:26 am #

    thumbs up if this saved you and you dont like your teacher

  141. mariedoubledee June 6, 2012 at 3:11 am #

    I hope you know that you are truly an amazing person for making these videos for all of your viewers. It is obvious that you know your stuff, and also, that you love what you do as well. You are helping thousands of people get through Biology/Anatomy, and I am just one of the thousands wanting to express my gratitude :) Thanks SO much!

  142. mariedoubledee June 6, 2012 at 3:11 am #

    I hope you know that you are truly an amazing person for making these videos for all of your viewers. It is obvious that you know your stuff, and also, that you love what you do as well. You are helping thousands of people get through Biology/Anatomy, and I am just one of the thousands wanting to express my gratitude :) Thanks SO much!

  143. iloveyouboyyyyy June 7, 2012 at 9:14 pm #

    I have been so confused by this concept and your video made it much easier to understand for my exam in 2 hours… Thank you! Keep making these videos!!

  144. iloveyouboyyyyy June 7, 2012 at 9:14 pm #

    I have been so confused by this concept and your video made it much easier to understand for my exam in 2 hours… Thank you! Keep making these videos!!

  145. sassinebernadette June 9, 2012 at 4:14 am #

    Thank you so much(: i totally understood, i have an exam about this, i was really nervous because i didnt really know until now cuz i watch ur amazing video.

  146. sassinebernadette June 9, 2012 at 4:14 am #

    Thank you so much(: i totally understood, i have an exam about this, i was really nervous because i didnt really know until now cuz i watch ur amazing video.

  147. SpartanXx666xX June 9, 2012 at 5:07 am #

    6 people failed their Bio Exam!

  148. SpartanXx666xX June 9, 2012 at 5:07 am #

    6 people failed their Bio Exam!

  149. Dechen June 9, 2012 at 11:36 am #

    I really truly loved your vedios which was so fun to study and easy to understand. Thank You so much for the nice vedios and quiz you made. :) Now I feel confident to do my exam on circulatory system. :P

  150. maghiarpuncher June 10, 2012 at 12:50 pm #

    this asshole nigger it’s reading every word from a book…

  151. maghiarpuncher June 10, 2012 at 12:50 pm #

    this asshole nigger it’s reading every word from a book…

  152. maghiarpuncher June 10, 2012 at 12:50 pm #

    this asshole nigger it’s reading every word from a book…

  153. TheBloodyAxes June 10, 2012 at 5:54 pm #

    atrioventricular valve*

  154. TheBloodyAxes June 10, 2012 at 5:54 pm #

    atrioventricular valve*

  155. laura mak June 11, 2012 at 4:04 am #

    thanks, helps a lot

  156. laura mak June 11, 2012 at 4:04 am #

    thanks, helps a lot

  157. laura mak June 11, 2012 at 4:04 am #

    thanks, helps a lot

  158. fwiesnh June 11, 2012 at 5:37 pm #

    Thanks a lot! Great video=awesome studying

  159. fwiesnh June 11, 2012 at 5:37 pm #

    Thanks a lot! Great video=awesome studying

  160. narcolepticBanana June 17, 2012 at 12:05 am #

    *superior and inferior vena cava

  161. narcolepticBanana June 17, 2012 at 12:05 am #

    *superior and inferior vena cava

  162. XDmiyukii June 17, 2012 at 8:30 am #

    thanks!!! this is so clear!

  163. XDmiyukii June 17, 2012 at 8:30 am #

    thanks!!! this is so clear!

  164. Levias7NL June 21, 2012 at 1:37 pm #

    Science? No Biology?

  165. Levias7NL June 21, 2012 at 1:37 pm #

    Science? No Biology?

  166. nishacat03 June 22, 2012 at 4:11 pm #

    for years i have ran away from trying to learn the blood flow of the heart. I definitely can now teach this thanks to your video. Very helpful :)

  167. nishacat03 June 22, 2012 at 4:11 pm #

    for years i have ran away from trying to learn the blood flow of the heart. I definitely can now teach this thanks to your video. Very helpful :)

  168. xxashiiexx June 25, 2012 at 2:14 am #

    amazing! .. to the point & exactly what I needed, thank-you

  169. xxashiiexx June 25, 2012 at 2:14 am #

    amazing! .. to the point & exactly what I needed, thank-you

  170. xxashiiexx June 25, 2012 at 2:14 am #

    amazing! .. to the point & exactly what I needed, thank-you

  171. Jessica June 25, 2012 at 3:05 pm #

    i love this im in ecg classes and this has helped me out tremendously i actually understand it better and i will continue to come here

  172. gizmokeeper June 26, 2012 at 3:42 pm #

    Thank you so much for posting this. No matter how many times I read about this I still could not picture it. This video really helped me learn and understand this.

  173. gizmokeeper June 26, 2012 at 3:42 pm #

    Thank you so much for posting this. No matter how many times I read about this I still could not picture it. This video really helped me learn and understand this.

  174. khaled1990 July 1, 2012 at 5:29 pm #

    i think that the vena cava are Duperior an Inferior not anterior Posterior

  175. khaled1990 July 1, 2012 at 5:29 pm #

    i think that the vena cava are Duperior an Inferior not anterior Posterior

  176. JolieEnCristo July 4, 2012 at 12:18 am #

    This vid keeps stopping!! @:*0 Seemed good though!

  177. JolieEnCristo July 4, 2012 at 12:18 am #

    This vid keeps stopping!! @:*0 Seemed good though!

  178. JolieEnCristo July 4, 2012 at 12:18 am #

    This vid keeps stopping!! @:*0 Seemed good though!

  179. SaiThel21 July 7, 2012 at 7:12 am #

    Your vid is really nice, but I’d like to point out one thing. The vena cavae are not posterior and anterior. They should’ve been named as superior and inferior. :)

  180. SaiThel21 July 7, 2012 at 7:12 am #

    Your vid is really nice, but I’d like to point out one thing. The vena cavae are not posterior and anterior. They should’ve been named as superior and inferior. :)

  181. zmerka1 July 8, 2012 at 4:39 am #

    This is the best teaching material ever. I am really strugling to understand this thru books and my professor’s lectures. This video explains it so clearly. Thanks a million for taking the time to make this video.

  182. zmerka1 July 8, 2012 at 4:39 am #

    This is the best teaching material ever. I am really strugling to understand this thru books and my professor’s lectures. This video explains it so clearly. Thanks a million for taking the time to make this video.

  183. zmerka1 July 8, 2012 at 4:39 am #

    This is the best teaching material ever. I am really strugling to understand this thru books and my professor’s lectures. This video explains it so clearly. Thanks a million for taking the time to make this video.

  184. Shayla Lavallais July 10, 2012 at 8:02 pm #

    where are you getting this info from??? it is definetly anterior and posterior

  185. Shayla Lavallais July 10, 2012 at 8:02 pm #

    where are you getting this info from??? it is definetly anterior and posterior

  186. khaled1990 July 10, 2012 at 10:09 pm #

    no it’s superior inferior, google it

  187. khaled1990 July 10, 2012 at 10:09 pm #

    no it’s superior inferior, google it

  188. dbscout July 11, 2012 at 6:42 pm #

    definitely more commonly referred to as inferior/superior vena cava in Western medicine, however, both are correct

  189. dbscout July 11, 2012 at 6:42 pm #

    definitely more commonly referred to as inferior/superior vena cava in Western medicine, however, both are correct

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  191. joanolisa1 August 2, 2012 at 3:35 am #

    Thank you so much! best explainantion ever!

  192. mrtherock60 August 8, 2012 at 3:02 pm #

    How do you improve the pump flow from the heart. I research it and found that 55 percent is the highest you can have. How can you improve the pump flow if somebody has a pump flow of 35%. What foods or medications can someone take, and if the person is little overweight would losing the weight would help. These are my questions.

  193. AlexHop1 August 16, 2012 at 3:21 am #

    Great video — really clear explanation!

  194. sushmita majumdar August 27, 2012 at 12:56 pm #

    best :)

  195. MRSGODBLESS86 September 6, 2012 at 1:16 am #

    Loved the video, it explained everything perfectly. Thank!

  196. 1223344556es September 7, 2012 at 12:04 pm #

    Wow. Are you an Indian? No, seriously.

  197. 1223344556es September 7, 2012 at 12:28 pm #

    Wow. You drew that? Teach me!

  198. Will Lee September 8, 2012 at 7:53 pm #

    Thanks bro, very helpful.

  199. sharonancy1214 September 12, 2012 at 3:25 am #

    Thank goodness my prof told us to look this up! Great pace and explanations! Thanks so much! :)

  200. Isnihayyah Rasul September 15, 2012 at 9:40 am #

    thanks for this.. You’re really good on explaining this one.. :)

  201. chic619 September 17, 2012 at 2:55 pm #

    This video helped me tremendously! Thank you SO MUCH!

  202. ChandaTia September 20, 2012 at 1:23 am #

    Thank you!

  203. TheTwinsMomy44 September 20, 2012 at 1:30 am #

    thank you so much! I have been a nurse for several years and none have made more sense than yours! You are a SuperStar!

  204. uzma asghar September 20, 2012 at 12:25 pm #

    u really helped :)

  205. Christeen Pivarnik September 20, 2012 at 10:08 pm #

    you voice makes me sleepy

  206. thrustae September 20, 2012 at 11:45 pm #

    Good video!
    Slight correction: the labels says anterior and posterior vena cava but they are superior and inferior.

  207. ntea12 September 21, 2012 at 6:02 pm #

    Fantastic video!!!!

  208. crystlification September 22, 2012 at 7:59 pm #

    Appreciate you very much! You are AWESOME!

  209. Janloy Quintero September 23, 2012 at 12:15 am #

    Incredibly helpful!! thank you.

  210. Leeroy928 September 25, 2012 at 9:48 pm #

    You’re a great teacher, thank you so much!!

  211. missrej123 September 25, 2012 at 10:32 pm #

    wow. i finally understood it! thank you so much.

  212. Lucia Garcia September 26, 2012 at 1:52 am #

    I think I understand it now lol! thanks

  213. LaShonda Perera September 26, 2012 at 7:58 pm #

    You really make it easy to understand.

  214. ShilpaCR7 September 27, 2012 at 4:37 pm #

    YOU ARE A LIFE SAVER!

  215. 1summersday September 27, 2012 at 10:06 pm #

    “the special thing about valves, is that it allows blood to flow in ONE DIRECTION.”
    I think i ll do pretty good for my bio test tomorrow….

  216. sciencemusicvideos September 28, 2012 at 3:44 am #

    Nicely done! I’d love for you to check out my rap about the circulatory system, “Pump it Up!” It’s at the sciencemusicvideos channel. Let me know what you think.

  217. hergleekybones September 28, 2012 at 9:01 am #

    THANK YOU SO MUCH FOR THAT. -3 you lifesaver!!

  218. Nicole Sobolewski September 29, 2012 at 8:58 pm #

    What a GREAT video! This is very simple and gets to the point without overwhelming you. Thanks!!

  219. samadoification September 30, 2012 at 1:53 am #

    so clear! thank you !

  220. Moody Moonchild September 30, 2012 at 10:54 pm #

    Thank you! This is awesome. I finally understand.

  221. spiralling1990 October 1, 2012 at 7:56 am #

    amazing video!!!!!!!! so much easier to understand man thank u1

  222. Joany Aquila October 1, 2012 at 7:14 pm #

    Excellent, thank you!! ♥

  223. Hanh Do October 2, 2012 at 1:40 pm #

    ssssooooo cooooollll!!!!! my presentation will be so great thanks to this video

  224. omg209 October 3, 2012 at 4:59 pm #

    as everyone else is saying…THANKS!

  225. Ariana Hallman October 3, 2012 at 8:29 pm #

    oooooohhhhhhh my gosh this very educational for my sisters and i

  226. Pamela Price October 4, 2012 at 4:34 pm #

    I love the way you broke everything down slowly. Much better than trying to decipher from my text book. I will look for more of your videos and your website for more help. This was GREAT! Thank you….a grateful A&P student.

  227. dollface0itm October 5, 2012 at 2:13 am #

    Thank you SO much! I was was so confused with how the heart works and it was extremely overwhelming with the notes from class. Now I finally get it! clear explanation and extremely helpful! recommended this to all my fellow bio students :)

  228. Anabellaes1 October 8, 2012 at 5:14 pm #

    Great review :),thanks a lot!!!

  229. xsugarbelle October 8, 2012 at 8:57 pm #

    I LOVE your accent!!! :D

  230. tidaz26 October 9, 2012 at 3:35 am #

    You are truly an amazing teacher. God bless you real good.

  231. dilwilhan1116 October 9, 2012 at 2:29 pm #

    Your videos are so helpful! I never understand what my Anatomy and Physiology professor is talking about in class but when I am studying I watch your videos and everything makes sense. Thank you so much!!!

  232. ArgueKO187 October 10, 2012 at 7:30 pm #

    shouldnt the Anterior and Posterior vena cava be Superior and Inferior Vena cava?

  233. Dakota Bridges October 10, 2012 at 10:09 pm #

    ya, they can be called either, or. The anterior (front) vena cava is also superior (upper, closer to the head), and the posterior vena cava (back) is also inferior (lower, closer to the feet). So, there’s one that flows into the upper/front part of the right atrium, and that flows into the lower/back part of the right atrium.

  234. daddycubjudah October 11, 2012 at 3:45 am #

    This is just wonderful!!

  235. dumpling23 October 15, 2012 at 4:05 am #

    You have no idea how clear and helpful this has been. THANK YOU!!!!

  236. RinnyRin69 October 15, 2012 at 4:29 am #

    This presentation was easier to understand than any of my high school biology classes. THANK YOU!

  237. optimaluse October 16, 2012 at 4:43 am #

    I could say thank you to every single video. you are fantastic. THANK U!

  238. halluvmeat October 16, 2012 at 10:57 pm #

    Thx, im going to good on the quiz!

  239. Sweetergrass October 21, 2012 at 9:13 pm #

    thank you so much, i feel more confident for my ECG exam this thursday. I even recorded it on my phone to hear it on my way to school. Thank you again, your amazing…..

  240. lnicol1986 October 22, 2012 at 2:46 pm #

    Great video thank you so much for the help!

  241. C.J. Bevins October 29, 2012 at 12:58 am #

    this is a great video! thanks sooooo much!!!!!

  242. Samar A.T October 29, 2012 at 3:29 pm #

    WOW! This is very useful. Thank you :)

  243. khabaloo82 October 29, 2012 at 5:35 pm #

    Great videos thank you very much….

  244. Dakota Barksdale October 30, 2012 at 2:29 am #

    Excellent explanation!

  245. 2ScarlyRose October 31, 2012 at 1:35 pm #

    This is fantastic thank you so much!

  246. Maloy Edwards October 31, 2012 at 9:20 pm #

    i learnd so much from this thank you
    sorry for spelling

  247. shavonnne9 November 2, 2012 at 6:33 am #

    That was very helpful thank you!

  248. vinabby16 November 2, 2012 at 4:36 pm #

    Great video.! Helped me memorize blood flow right before a bio exam!

  249. loverofbeats November 5, 2012 at 7:22 am #

    who would dislike these videos…

  250. amromi November 5, 2012 at 11:54 pm #

    It is the inferior and superior vena cava, not anterior and posterior

  251. Denisey411 November 6, 2012 at 7:21 am #

    perfect! thank u! i wish my teacher could teach like u

  252. Carmilla66 November 6, 2012 at 11:35 pm #

    Thank you, this was very helpful! You’re very clear and systematic.

  253. Donna Lemon November 8, 2012 at 4:12 am #

    inferior and superior (meaning lower and upper), not anterior and posterior (meaning front and back) vena cava

  254. Yasmin Fadol November 9, 2012 at 1:27 am #

    Got It.. Thank You

  255. BoldBeats November 9, 2012 at 4:43 am #

    You just saved me for my anatomy test. thanks. :D

  256. lillifur November 9, 2012 at 9:39 pm #

    Amazing. Thank you!

  257. greg Norbut November 13, 2012 at 4:01 am #

    very helpful!

  258. aliya khatun November 13, 2012 at 3:11 pm #

    really a epic video

  259. danymed08 November 13, 2012 at 6:44 pm #

    I like human anatomy very much.

  260. ns lai November 15, 2012 at 5:11 am #

    Great video! Easy to understand.

  261. nicole carrier November 15, 2012 at 9:54 pm #

    This was very informative to me! I wish I was able to take the written notes and the picture. That is the best explanation I have seen out there! Great Job! thank you for sharing!

  262. Tessa191225 November 16, 2012 at 11:43 pm #

    Thank-you this video was really helpfull I now fell very confident for my exam (:

  263. Newme Oldme November 17, 2012 at 6:28 pm #

    Thanks sam !!! really clear awesome explanation ,
    ,,,,, u saved my time !!!

  264. xyzjoanna November 19, 2012 at 2:04 am #

    Calming voice…thanks :)

  265. Hercarful November 19, 2012 at 8:21 am #

    Well done, easy to understand, great job. Thank you

  266. dianafavela1 November 20, 2012 at 5:22 am #

    Awesome explanation. But isn’t inferior and superior vena cava based on the place they are located ?. I appreciate if you explain that to me. Great job !!

  267. aliyahc0308 November 21, 2012 at 2:24 am #

    Luv it! So much better w visual n explanation

  268. Ranaaa2011 November 25, 2012 at 10:01 pm #

    My exam is tomorrow and I couldn’t understand a word till I saw this video :) I’m speechless thanks.. This really helped !!

  269. YI- YUKI November 27, 2012 at 3:52 am #

    Very very best explanation, clear and very easy to understand, highly recommended!

  270. lums lalle November 28, 2012 at 2:54 pm #

    You can’t make it fun. :-/

  271. rosieoranges November 29, 2012 at 2:15 pm #

    you silly child, it has way more than one name-.-

  272. amromi November 29, 2012 at 4:03 pm #

    I’m not a child moron. They are named superior vena cava, and inferior vena cava. They are named this way due to their positions.

  273. Elizabeth Anne November 29, 2012 at 11:47 pm #

    Its fun when you get your hw done fast!! lol (:

  274. Gisha Mathew November 30, 2012 at 8:50 pm #

    Thank you very much for this video. I finally understand this stuff.

  275. rosieoranges November 30, 2012 at 10:05 pm #

    Buy a biology text book, educate yourself, and then talk to me.

  276. Kellie Spriggs December 4, 2012 at 3:09 am #

    Thank you so much!! You explain everything to well and make it a lot easier to understand! Many Thanks :)

  277. Michele Mary December 5, 2012 at 3:37 am #

    I love this video, it helped me gain a better understanding. Thank you !!

  278. Happy30Too December 5, 2012 at 4:33 am #

    Perhaps the most interesting research coming out on prevention of heart disease is the study published two weeks ago by the journal CIRCULATION of the American Heart Association. This 10 year NIH funded study found a 48% reduction of heart disease in people who were taught Transcendental Meditation. The control group used the standard education program. This finding was even more significant when looking at those who were most regular with their twice a day practice–66% in that group.

  279. Happy30Too December 5, 2012 at 4:41 am #

    Perhaps the most interesting research coming out on prevention of heart disease is the study published two weeks ago by the journal CIRCULATION of the American Heart Association. This 10 year NIH funded study found a 48% reduction of heart disease in people who were taught Transcendental Meditation. The control group used the standard education program. This finding was even more significant when looking at those who were most regular with their twice a day practice–66% in that group.

  280. ntokozo dube December 11, 2012 at 2:26 am #

    like it

  281. ntokozo dube December 11, 2012 at 2:27 am #

    like

  282. Rowena Gorgonio December 13, 2012 at 11:28 am #

    Thank you so much for this.. Now, I understand better and wider…

  283. Mohammed Jedaan December 14, 2012 at 12:51 pm #

    You said Posterior & Anterior,I guess they should be called inferior & superior,are they?

  284. mhel mendoza December 19, 2012 at 8:39 pm #

    =)

  285. xoxodance996 December 19, 2012 at 9:02 pm #

    omg this helped so much thanks

  286. sexylegs718 December 27, 2012 at 6:17 pm #

    Thank you very much for this video. I’m studying EKG and blood flow of the heart for a Patient Care Technician class & this is very helpful. I will subscribe so that in the future when I start the nursing program this site will be my second teacher. God bless you…

  287. DonAnt14 December 29, 2012 at 9:55 am #

    This is easy

  288. MrChannel5news January 2, 2013 at 1:12 am #

    u mad bro? :D

  289. Hannah Goodwin January 2, 2013 at 4:15 pm #

    THANKYOU

  290. Scott Drinkwater January 3, 2013 at 4:31 pm #

    You don’t realize how much you have helped my last minute revision

  291. 0113slimshady January 4, 2013 at 2:25 am #

    Been r

  292. 0113slimshady January 4, 2013 at 2:26 am #

    Been reading a textbook for ages, but when I listened to this video I learned everything for my exam! Thanks soo much

  293. lilprincessliza January 5, 2013 at 3:56 am #

    OMG this is probably the 4th time having to learn this….I know it for the test and then after that its normally out of head but after this video it’s actually sticking….thanks so much!!

  294. ihatefreemasons January 5, 2013 at 11:50 pm #

    I LOVE YOU FOR MAKING THIS VIDEO IT’S REALLY HELPFUL!! Thank you :)

  295. Nicole Uche January 6, 2013 at 10:53 pm #

    9s one, thanks

  296. SuperRoyalFlusher January 12, 2013 at 11:51 am #

    Thanks, Homework Done

  297. Keralasutra January 13, 2013 at 9:59 am #

    Thanks. Ready for exam under 5 mns.

  298. Ted P January 19, 2013 at 11:04 pm #

    Thanks

  299. Ted P January 19, 2013 at 11:06 pm #

    I’m major in cardiovascular and this explained so much better. Thank you so much.

  300. MahMabel January 22, 2013 at 2:09 pm #

    Thank you very much this helps me a lot !

  301. Snip3R00L January 23, 2013 at 7:21 am #

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  302. Jeph Baculina January 23, 2013 at 8:14 am #

    Sir/Madam, your video is very informative and useful. May I copy it so that I can use it during my class…Thank you very much

  303. MsYumo4 January 24, 2013 at 10:30 am #

    owesome, never understand before. superman doctor,,thanks.

  304. MustafaQ93 January 28, 2013 at 12:15 am #

    It would be a shame for you not to burn fat when these other normal people are able to shed pounds so easily using Fat Blast Factor (Look it up on google).

  305. Jeanette Clark February 3, 2013 at 11:28 pm #

    blood flow

  306. sonea al hason February 7, 2013 at 4:47 am #

    thak you alut i’m very interset with this

  307. Sarah Alkaj February 8, 2013 at 3:27 pm #

    Anterior/ posterior are commonly interchanged with superior/inferior. This is likely due to preference of proper zoological terminology.

  308. Frankkiany February 13, 2013 at 4:41 am #

    it was perfect . Thanks

  309. fighting1rish February 14, 2013 at 6:26 pm #

    Thank you for this! I really had trouble remembering the names of everything but watching this step by step really helped

  310. muwakil khalil February 21, 2013 at 2:50 am #

    i like this one it is make sense to me,thank you

  311. OriginalRipndip February 23, 2013 at 6:15 am #

    Love u man new semester same anatomy. Thanks professor please don’t ever take these videos down. Your photos are so efficient and clean. Source?

  312. hyang02 February 25, 2013 at 4:03 pm #

    this was so helpful! Thank you and God Bless :)

  313. TM Arun Kumar February 26, 2013 at 5:44 am #

    Heart works like Multi piston.

  314. asrar448 February 27, 2013 at 3:57 pm #

    Thank u so much I understand it very well with keep going

  315. asrar448 February 27, 2013 at 3:58 pm #

    Thank u so much I understand it very well with you keep going

  316. crg89carlos1989 February 27, 2013 at 7:05 pm #

    You should replace my Anatomy Professor!

  317. Marcela Martinez February 27, 2013 at 10:07 pm #

    Marry me!!!!. You are the best!!!!!!

  318. InteractiveBiology February 27, 2013 at 10:46 pm #

    LOL, my wife might have a little bit of a problem with that one there, but I’m glad you’re enjoying the videos ;)

  319. MrCatracho1800 March 1, 2013 at 7:22 pm #

    you are an awesome professor, you explain everything very clear

  320. Nada Kazzaz March 3, 2013 at 12:20 pm #

    thank you so much. i can not begin to explain how many anatomy exams you have helped me through. i will continue to watch your videos for a long time

  321. nadiebumbleBEE March 5, 2013 at 11:43 pm #

    THANK GOD FOR JESUS! you are amazing! explained that to me like no one could!!

  322. Muddy A March 6, 2013 at 7:30 am #

    SubhnAllah

  323. HereeWeeGo34 March 7, 2013 at 1:06 pm #

    Very Nice video, watching this before my Anatomy practical haha

  324. Charlotte Simoons March 9, 2013 at 7:39 am #

    Thank you so much for posting this! It helped me a lot :D

  325. Elizabeth Ruddek March 12, 2013 at 7:58 pm #

    excellent introduction to the circulation of the heart! excellent!

  326. scorpio1600 March 13, 2013 at 7:31 pm #

    Thank you so much for posting this video! You rock!!!!:)

  327. Erin3085 March 17, 2013 at 5:53 pm #

    My entire cardio unit in pharmacology just clicked…thank you so much! You broke it down perfectly! Leave it to youtube to clear up in 10 minutes what a 4 hour nursing lecture couldn’t.

  328. Sara Chequer Costa March 18, 2013 at 11:40 am #

    I’m so glad I have found you. I’m from Brazil, and I can understand perfectly what you say, your english it’s so clear and helps me a lot, as I’m studying A levels in England to be able to go to university! THANK YOU, and I will defo follow you!

  329. K Kelsay March 19, 2013 at 11:57 pm #

    Awesome!!!!!! Thank you so much…. I understand!

  330. svannagogreen March 20, 2013 at 9:26 pm #

    Thank you so much! You make much more sense and break it down much better than my professor. :))

  331. fat balloon March 23, 2013 at 6:22 am #

    Thank you so much, keep it up, atleast now i know which youtube video to go to :D

  332. Lladira NZ March 23, 2013 at 8:14 am #

    thanks, you have a nice way of explaining simply and without rushing. Very helpful identifying the other known names for structures!

  333. steph10892 March 24, 2013 at 11:28 am #

    Very helpful! Thank you!

  334. Ianna Javier March 24, 2013 at 1:19 pm #

    I normally do not comment in this videos but damn!! you are amazing!! Clear as water! Thank you!

  335. pz3j March 24, 2013 at 8:26 pm #

    You are a gift to humanity! Thank you for teaching this complex material with such clarity and compassion.

  336. Anna M. March 24, 2013 at 10:55 pm #

    I studied this many years ago but I never got such a excellent explanation like this. Thank you !

  337. MrEmt133 March 24, 2013 at 11:45 pm #

    I’m in paramedic school and this has helped so much, thanks!

  338. timothysobrinski March 25, 2013 at 12:32 am #

    Great explanation. Thanks!

  339. Deyan Dachev March 25, 2013 at 4:51 pm #

    Very good explained.This is the 3rd video of heart that I watched and I finaly understood it .Thank you for your work :)

  340. Kimberly Paul March 25, 2013 at 6:36 pm #

    Great Explanation!

  341. Nina Bonilla March 25, 2013 at 7:07 pm #

    Thanks you very much for this video … big help for my test. :D i appreciate it,

  342. Shaletail March 26, 2013 at 7:00 pm #

    This was a big help for me (vet tech school); I’m feeling more confident about my A & P midterm now. Thanks! =)

  343. Jason Cao March 26, 2013 at 9:31 pm #

    thank you so much, i have my anatomy test tomorrow :)!!

  344. Christian M March 27, 2013 at 4:31 pm #

    Thank you that was very helpful

  345. asantewaa jordan March 28, 2013 at 12:41 am #

    thank you

  346. MsQueenKatie March 28, 2013 at 2:27 am #

    Thanks.

  347. Rhonda Junaid March 28, 2013 at 2:55 pm #

    Very good video for learning! thank you!

  348. alzubaidy23 March 28, 2013 at 3:08 pm #

    طاح حظكم

  349. mayfair3854 March 29, 2013 at 8:01 am #

    Thank You so much for this video..:) Do you have anything for Cardiac Cath Lab Calculations?

  350. Rednamalasaurus March 29, 2013 at 11:41 am #

    thanks

  351. Agi S April 3, 2013 at 7:15 am #

    many thanks !!!! thats such a clear explanation xxxx

  352. Jul3z989 April 3, 2013 at 11:42 am #

    Great help!!! thank you for making it easy and understandable.

  353. kyat trina April 3, 2013 at 9:37 pm #

    merci beaucoup

  354. 97Bluestars April 6, 2013 at 12:57 pm #

    AHHHH FUCK I HATE BIOLOGY

  355. xo kizza April 6, 2013 at 4:07 pm #

    thank you for clarifications i understand it all..bio lab exam tomorrow ! =)

  356. Farhan Khan April 7, 2013 at 2:39 pm #

    thnkx buddy u have a great teaching skill ;) but i think that u should continue this with animation :(

  357. LisaJo Borchers April 7, 2013 at 9:12 pm #

    This is tremendous help. The pace is exactly right for me to make connections with my texts–thanks

  358. Kaeldannas April 8, 2013 at 1:41 pm #

    You Sir,Deserve All My Respect.I’m studying for an exam in order the get accepted to a Medical College.This helped me a lot.Thank you.

  359. Nikita Rusov April 9, 2013 at 9:35 am #

    yes. before I started eating right it didn’t matter how much I exercised my abs were still jello. But My international body building trainer also recommended this 7 food elements to kill your fat belly. you can see it here > bit.ly/148rTe8?=dnojh

  360. Ams Babz April 9, 2013 at 4:52 pm #

    Thank you so much for the video is really informative and enlightening! I understand the transport system much better plus am having a biology test tomorrow so its super useful :D

  361. Afroza S April 9, 2013 at 9:46 pm #

    Someone give this man an award!

  362. Lindsey Wheeler April 9, 2013 at 11:02 pm #

    just started my EKG class tonight, this helped me soooo much! Thank you!!! you are a brilliant teacher!

  363. Leon Lai April 9, 2013 at 11:22 pm #

    an award in heart or something lol

  364. gerome ribu April 10, 2013 at 4:11 am #

    Very good! easy to understand :) highly recommended

  365. AkilaViraj1 April 12, 2013 at 6:09 am #

    thanks

  366. Genevieve Clarke April 12, 2013 at 8:17 am #

    Thank you. That was so helpful. Please do more. :o)

  367. abhinav padmawar April 13, 2013 at 11:55 am #

    awesome………!!!!!!!!!!!

  368. MrsCansu April 14, 2013 at 2:10 pm #

    should not it be SUPERIOR vena cava and INFERIOR vena cava??? instead of anterior and posterior..thanks for the video :)

  369. Alex Jones April 14, 2013 at 5:54 pm #

    Very helpfull, thanks alot

  370. Sylvia Alapaap April 15, 2013 at 2:51 pm #

    thank you God bless you more with wisdom..

  371. Jason Taylor April 15, 2013 at 7:29 pm #

    Very nice descriptive video!

  372. thefivespot12 April 17, 2013 at 11:46 am #

    Yessss!

  373. Meestarcheez April 17, 2013 at 7:26 pm #

    Making biology fun? Well I’m shit out of luck. I’m here for anatomy

  374. RaithelBR April 18, 2013 at 12:29 am #

    I think this is the best video showing how the blood flows through the heart. It helped me greatly for Anatomy, now I’m refreshing for nursing school.

  375. RaithelBR April 18, 2013 at 12:29 am #

    I think this is the best video showing how the blood flows through the heart. It helped me greatly for Anatomy, now I’m refreshing for nursing school.

  376. Cindy Le April 18, 2013 at 11:55 pm #

    you’re right! they’re the same thing though. The superior vena cava is also called the anterior vena cava, and the interior vena cava is also the posterior. Hope this helps. ^^~

  377. MrsCansu90 April 19, 2013 at 3:46 pm #

    yeah, I just checked it after I wrote the comment =D But, thank you cindy :)

  378. capodex jessay April 20, 2013 at 12:23 pm #

    just watched dis, nd was really helpful. am no more nervous 4 ma exam. lol

  379. Pooja K April 20, 2013 at 11:54 pm #

    This was soooo helpful, i can’t thank you enough! :) you’re the best keep the videos coming please :D

  380. nanseee101 April 23, 2013 at 8:50 pm #

    How often does the heart pump blood to the body in one day? Great video by the way :)

  381. lithiumkc8 April 23, 2013 at 9:11 pm #

    adult heart rate = 60-100 beats per minute
    with each heart beat it roughly puts out 70cc of blood
    the heart pumps 4 -8 liters of blood a minute
    In one day the heart pumps 5760-11520 liters of blood per day

  382. Sa'ath Shiyam April 24, 2013 at 11:41 am #

    Finally a video that actually helps! thankyou so much for this video :D

  383. Glowing4Life April 25, 2013 at 9:28 am #

    Thank you thank you thank you! Finally someone who can really explain this simply and for informatively. God Bless! =)

  384. Vaasu97 April 25, 2013 at 8:23 pm #

    ur a guardian angel sent from above

  385. lawrence ekanem April 27, 2013 at 5:01 am #

    THANK U, KEEP D GUD WORK ALIFE

  386. bobby dunmore April 27, 2013 at 8:20 pm #

    Thank Thank Thank …! I finally understand this process. You are a great teacher!

  387. iamablond99 April 29, 2013 at 9:30 pm #

    That helped a whole lot, and i’m in a low grade and i understand that! Made my science class a bunch easier. I even recommended it to my teacher!

  388. Andrew Finnigan April 30, 2013 at 7:12 am #

    Wow thanks this really helped me! :)

  389. Charl Charlie April 30, 2013 at 10:54 am #

    Very clear and simple to follow. Thank you. The Posterior cena cava is also known as the Inferior vena cava and the Anterior is also known as the Superior vena cava. I have just learned that too!

  390. preaty12flower May 1, 2013 at 6:42 am #

    THANK YOU SO MUCH!

  391. plotman3 May 1, 2013 at 9:23 am #

    thanks 4 the facts!

  392. missdidzdidz May 1, 2013 at 5:08 pm #

    Thank You soo much. You’re a life saver and you are one phenomenal educator.

  393. kaunda cleopatra May 2, 2013 at 11:27 am #

    wow!!you made so understandable.thankyou

  394. avanzato13 May 2, 2013 at 11:56 pm #

    THANK YOU, SO HELPFUL

  395. david lin May 3, 2013 at 6:45 am #

    thank you sooo much

  396. Snow Pear Chang May 3, 2013 at 11:55 am #

    :)

  397. Kristen Link May 5, 2013 at 12:22 pm #

    Thank you for this video! I’m pretty squeamish, and this video explained everything in a way that was easy to understand, but also didn’t make me feel squeamish about the fact that blood was being talked about. Also, your voice is really nice for teaching!

  398. kimmyk0323 May 6, 2013 at 11:59 am #

    Thank you for teaching the blood flow through the heart. You explained very well. Thanks again!!

  399. sanohziP May 8, 2013 at 11:34 am #

    amazing clearly!

  400. Melvin Duley May 8, 2013 at 11:32 pm #

    thank you

  401. Ann Pham May 10, 2013 at 1:56 am #

    He forgot to mention that in order for the blood to flow to the right ventricle from the right atrium the tricuspid valve has to open– tricuspid valve then closes after blood has flown to the right ventricle

  402. lithiumkc8 May 10, 2013 at 3:13 am #

    visit my channel to see the video Time to pay up, Timmy!
    Please comment, like and subscribe.

    you wont regret it!

  403. MegaYyc May 11, 2013 at 2:59 pm #

    this was great. I learned more in the 9 minutes than i did reading my textbook for an hour

  404. kryan916 May 12, 2013 at 9:00 pm #

    This video is amazing! Any chance you could do a few on congenital heart defects? Thank you for this!

  405. John Guillen May 14, 2013 at 10:35 pm #

    Thank you for your videos, they are very helpful.

  406. saraharnone1 May 14, 2013 at 11:36 pm #

    Thank you thank you thank you!! My instructor wasn’t making it clear that there were different names for the same valves which was where I kept getting so confused. You Leslie are a lifesaver. I have now subscribed to your channel. Thanks again!

  407. margaret jones May 15, 2013 at 11:45 pm #

    Thank you so much!!!

  408. rayco10 May 17, 2013 at 3:31 am #

    Dude your awesome…I would buy your book, but I don’t really need it. Thanks bro

  409. Luv2Shop313 May 20, 2013 at 7:56 pm #

    Great video, but I just want to point out that it’s the superior vena cava and inferior vena cava because anatomically, they are positioned top and bottom, not front and back.

  410. hadiya ali May 24, 2013 at 4:55 am #

    U are amazing… Thank you. I passed my presentation n this video made it easy for me. Thank u

  411. hadiya ali May 24, 2013 at 4:55 am #

    U are amazing… Thank you. I passed my presentation n this video made it easy for me. Thank u

  412. siyon de alwis May 25, 2013 at 9:14 am #

    wonderful this is one of the example for innovative way of education

  413. Nhat Nguyen May 25, 2013 at 1:37 pm #

    You are amazing. Im taking my nremt soon and I finally understand. Thank You!

  414. grammarcorrector101 May 25, 2013 at 6:08 pm #

    Thank you for your knowledge. Appreciate it!

  415. vignesh venkat May 27, 2013 at 10:23 pm #

    cool…

  416. Katie Rundzieher May 30, 2013 at 9:19 pm #

    Thank you thank you thank you soooo much! you explained the circulatory system a million times better than my biology teacher, Hank Green from CrashCourse and Bill Nye the Science Guy! I cannot express how much gratitude i have for you.

  417. RadhaSyam108 June 5, 2013 at 3:51 pm #

    What a great teacher. Teachers are great when they make it easy for the student to learn even complicated material. Thanks!

  418. RadhaSyam108 June 5, 2013 at 3:51 pm #

    What a great teacher. Teachers are great when they make it easy for the student to learn even complicated material. Thanks!

  419. amir farokhi June 5, 2013 at 7:03 pm #

    god bless you!!!

  420. HairNailsBeautytips June 8, 2013 at 4:57 am #

    OMG! I LOVE THIS VIDEO. THIS IS GOING TO HELP ME PASS MY NATIONAL TEST. GOD BLESS YOU

  421. Barbara O June 8, 2013 at 1:12 pm #

    Thank you for the video it has helped with my cardiology class.

  422. DREBEN H June 9, 2013 at 5:49 am #

    thank you for your very thorough explanation of the hearts process!

  423. Curt Chavoustie June 9, 2013 at 3:17 pm #

    You are da man yo!

  424. quoc bao Nguyen June 11, 2013 at 10:19 pm #

    These videos is a good quick review for my mcat lol.

  425. Paola Ramos June 15, 2013 at 12:42 am #

    Awesome video! Thanks for sharing your knowledge. :-)

  426. shamrock18th June 17, 2013 at 3:04 am #

    thanks buddy. nailed it

  427. deanna Thomas June 17, 2013 at 2:29 pm #

    You are the best just learned this video in a little of no time much love

  428. deanna Thomas June 17, 2013 at 2:29 pm #

    You are the best just learned this video in a little of no time much love

  429. abel cassule joão joão June 18, 2013 at 7:51 am #

    this is video is very good i like

  430. Ge Ge Ayiti June 20, 2013 at 10:32 pm #

    Wow that was awesome you explained this so clear. Thank you, thank you, thank you.

  431. Johnphil Ronaldo June 24, 2013 at 5:16 am #

    Thanks for you I understand about the heart. Thanks :D

  432. lohvar su June 24, 2013 at 6:44 pm #

    thank you very muccccch sir” GBless you and your work…

  433. Elizabeth Gardener July 1, 2013 at 6:05 pm #

    very good video…explained it so clear

  434. roxes deniega July 7, 2013 at 8:15 am #

    I’ve seen this video a couple of times already and really it helped me a lot…
    thank you so much sir please continue inspiring us to study and helping us as well in our hardships when it comes to problems like this…

  435. vanessa moore July 8, 2013 at 6:52 pm #

    for some reason remembering the order of functions/names in the heart has been a problem for me. like everyone else has said already you explained it very clearly and made it easy for me to remember. thank you!

  436. sonicshotdown July 15, 2013 at 8:01 pm #

    simple yet understandable..good job..Thanks!

  437. Ummi YusufwaDawud July 19, 2013 at 3:28 pm #

    Masha Allah. Alhamdu Lillah that i found this video. Thank you so much and may the Almighty Bless You. Ameen.

  438. Thomas Kernan July 19, 2013 at 9:05 pm #

    who calls the superior and inferior vena cava anterior and posterior?

  439. vignesh dhanabalan July 22, 2013 at 9:30 am #

    it was wonderful.could understand the complete physiology of the heart

  440. Blair Greene July 23, 2013 at 5:48 pm #

    Nice vid, thanks…

  441. Anand Tapadar July 24, 2013 at 2:21 pm #

    Both are correct. The superior vena is positioned anteriorly and inferior vena cava is positioned posteriorly in the chamber of right atrium.

  442. Isabella Halligan July 26, 2013 at 8:10 pm #

    U mixed the colours up! >:(

  443. vidura rodrigo July 30, 2013 at 1:18 am #

    That was such a mess when i was learning this lesson – ‘ Blood Circulation ‘. But your video made that so clear, crystal and shallow. Your teaching method is admirable. Thank you so much!!!

  444. ssymendoza1 August 1, 2013 at 7:32 am #

    VERY helpful video! Thank U!

  445. Tiffany Whited August 3, 2013 at 11:41 pm #

    Thank you soo much, you a very smart and simplify it well!

  446. Preston Vo August 7, 2013 at 8:14 pm #

    Thank u so much.i have less than a month before taking PCAT and I really need this to reinforce my bio knowledge. Very helpful..

  447. Jessie Moon August 9, 2013 at 12:25 am #

    Thank you for uploading this video. It was very helpful. Cheers

  448. cool2me4u August 12, 2013 at 10:32 am #

    love 2 be ur frd

  449. cool2me4u August 12, 2013 at 10:32 am #

    u stole my heart

  450. jasmine nana August 14, 2013 at 5:23 am #

    nice and easy to learn…hope to meet you in person..thumbs up for you…im a nurse here in philippines..tnx a lot c”,)

  451. Janoca2011 August 15, 2013 at 7:03 am #

    Really helpful video, thank you!!!

  452. Nerdswagger88 August 16, 2013 at 12:09 am #

    Your series are all kinds of amazing! Med students across the world thank you!!!!

  453. Mareeah Jinky dela Cruz August 19, 2013 at 3:36 am #

    Thank you so much for posting this. Big help.

  454. Mareeah Jinky dela Cruz August 19, 2013 at 3:36 am #

    Thank you so much for posting this. Big help.

  455. hunger4jsutice August 23, 2013 at 11:50 am #

    R and L pulmonary veins carrying the oxygenated blood..do the R pulmonary veins also empty into the left atrium? Thank you for your videos.

  456. Diddy Bivens August 25, 2013 at 5:09 pm #

    Thank you now hopefully ill pass my test tommorow

  457. Rajab Rana August 26, 2013 at 1:07 am #

    it really help me to understand more easily thank you

  458. McKenzie Ashcraft August 28, 2013 at 12:36 am #

    Very helpful!!! Thank you!

  459. Karen Jenner September 7, 2013 at 12:15 pm #

    thank you for your help!

  460. Maksim Ishankhanov September 8, 2013 at 11:48 pm #

    Thank you soooo much!!!

  461. Jorge Garcia September 9, 2013 at 3:19 pm #

    Keep your arteries clean always get “L-Arginine” Nitric Oxide (Cardio Vida) here: h ttp://jorgeg.bestlifecentral.c­o m It’s make from Texas USA to World Wide if you have any question send it to: blww2012 at gmail.co m Good Luck!

  462. NAZARET957 September 14, 2013 at 6:44 pm #

    GREAT !!! I was trying to understand the process before. just now I got it. You made it easily to understand . THANK YOU VERY MUCH. GOD BLESS YOU!!!

  463. Paulina September 14, 2013 at 6:35 pm #

    Waaaah i just found this website…. Thank god! You are amazing! Thank you , all of these will help me for my cardiophysiologyexam!

  464. Monika Dorrian Perlstein September 16, 2013 at 12:24 pm #

    Thank you so, so much for helping me to understand this. :-)

  465. Monika Dorrian Perlstein September 16, 2013 at 12:24 pm #

    Thank you so, so much for helping me to understand this. :-)

  466. Kushal Rahatkar September 17, 2013 at 12:43 am #

    thanks u explained very clearly and nicely than my science teacher

  467. jazzyfizzlelive September 20, 2013 at 11:31 pm #

    Thank you for taking the time to teach this material, it is so much easier to understand than reading a book.

  468. gabbysmom11 September 21, 2013 at 2:45 pm #

    This is absolutely perfect! Thank u!!!

  469. Ginny Kindred September 21, 2013 at 6:13 pm #

    This helped so much! Thank you for such a nice illustration and explanation. :)

  470. mizmimzie September 22, 2013 at 9:41 pm #

    OMG GOD BLESS YOU

  471. abhinav omprakash September 24, 2013 at 12:51 am #

    great video. thanks a ton. May god bless you !!! thanks a lot. Thanks for taking the time to spread your knowledge. thanks !! :)

  472. ilurvpanda September 26, 2013 at 10:06 am #

    OMG thanks my exam is tmr u saved my life!

  473. Dr. Rajesh Sharma September 26, 2013 at 12:22 pm #

    Thanks a lot ,.made explanation easy.

  474. Odiyanaa Ravi Swamukth September 26, 2013 at 9:13 pm #

    hi samuel, thank you so much for your kind explanation…. you gave me a relax mind by going through details of each circulation…. wish you are my teacher at my class…

  475. Shafiqur Rahman September 27, 2013 at 2:48 am #

    A LOT OF THANKS

  476. Virginia Dominguez September 27, 2013 at 11:31 am #

    This is such a great explanation and video!

  477. Jan Amber Rose September 28, 2013 at 7:38 am #

    Let’s try to keep up on this stuff as we get older we should know this,
    especially for my family because we have a tendency to die from Heart
    problems.

  478. Thomas McCarthy September 29, 2013 at 10:04 am #

    I found this very interesting, thanks for posting.

  479. fffashionjh September 30, 2013 at 11:04 pm #

    Thankyou soooooomuch omg I have never learned the heart this easy! amen

  480. jaymala kumawat October 1, 2013 at 4:40 am #

    jjjj

  481. HentaiQueen October 3, 2013 at 1:06 pm #

    The blue ventricle looks an awful lot like a penis

  482. FRANCISCA NZEKWE October 6, 2013 at 6:16 am #

    oh My God I enjoy the lecture; when I saw the cardiac cycle, I was scared, but now, I can teach it to other people myself. Thank you, you are a God saver

  483. abdoo ragab October 6, 2013 at 2:48 pm #

    thanks alot

  484. Lex October 6, 2013 at 7:04 pm #

    Thanks a lot! It’s the little things that you say that makes such a huge difference. For example, “The antrioventricular is in the middle–and that makes sense because it is between the atrium and the ventricles.” It’s hard to see the obvious when you are so overwhelmed with everything else, so things like that really helps!

  485. Laura Krager October 10, 2013 at 6:25 pm #

    Totally loved this! thank you!!!

  486. Scarlet Joh October 10, 2013 at 10:21 pm #

    Much appreciated, friend!

  487. Kamila Biriulynaite October 13, 2013 at 3:01 pm #

    thank you so much for this fabulous video :)

  488. kalpesh patel October 13, 2013 at 3:37 pm #

    Thank you so much, u have cleared my idea about blood circulation. I didnt understand when my tutor explain me. You are great

  489. bsa0852 October 18, 2013 at 3:16 am #

    Thanks for you .. It’s very clear

  490. bsa0852 October 18, 2013 at 3:16 am #

    Thanks for you .. It’s very clear

  491. Nonhle Sibiya October 20, 2013 at 10:36 am #

    i finally get it!

  492. Glenda V. October 23, 2013 at 11:49 am #

    You are amazing! Keep up the good work! God Bless you!

  493. alex biocanin October 23, 2013 at 1:45 pm #

    Yo yo… Fine movie.

    My older brother used to be an obese bloke. He changed himself from 284lbs of pure fat to 200 lbs of absolute lean muscle. I couldn’t believe it! I just joined myself coz I wanna strengthen. He made use of the Muscle Building Bible (Search on Google)…

  494. alex biocanin October 23, 2013 at 1:45 pm #

    Yo yo… Fine movie.

    My older brother used to be an obese bloke. He changed himself from 284lbs of pure fat to 200 lbs of absolute lean muscle. I couldn’t believe it! I just joined myself coz I wanna strengthen. He made use of the Muscle Building Bible (Search on Google)…

  495. Juan Rivera October 26, 2013 at 3:42 pm #

    very well explained, I love it.

  496. phindy p October 26, 2013 at 7:43 pm #

    nyc 1 GOD bless u

  497. moniquedaleymd October 27, 2013 at 8:14 am #

    May God send down his many blessings upon you. You explained with such detail. This is coming from a student who was fighting to
    understand the functions of the heart. God bless! Monique D

  498. sarah loutzenhiser October 27, 2013 at 2:54 pm #

    Wow this is amazing! You make it easy to understand =) I will be watching more of your videos as I travel through my classes!

  499. Karina Najarro October 28, 2013 at 12:49 am #

    amazing explanation!!!

  500. Geraldine Molina October 28, 2013 at 1:33 pm #

    Awesome explanation. You are the best!!!! The more I study the human body, the more I’m amazed by it.

  501. John Tan November 3, 2013 at 5:01 am #

    aren’t the pulmonary veins labelled wrongly? they should be on the left of the heart

  502. Cell Sciences Inc. November 3, 2013 at 12:47 pm #

    See this video to learn how blood flows through the heart:

  503. Shane holgate November 3, 2013 at 12:57 pm #

    See this video to learn how blood flows through the heart:

  504. LaTrina Treadway November 3, 2013 at 9:49 pm #

    See this video to learn how blood flows through the heart:

  505. Suzane Tshibala November 4, 2013 at 3:11 pm #

    You’re simply awesome. Thank u sooo much and keep up the brilliant work :D

  506. Debora Commins November 4, 2013 at 3:21 pm #

    I am also fascinated!!! Anatomy was my favorite subject at University.

  507. Debora Commins November 4, 2013 at 3:22 pm #

    Made it so easily. Amazing explanation.

  508. Katherine Astaneh November 5, 2013 at 10:24 am #

    The body is truly an amazing work. You have expressed this process to a level of understanding…thank you so much! I look forward to seeing more.

  509. hydarali vilayil November 6, 2013 at 8:28 am #

    Good one

  510. Felicia Horton November 6, 2013 at 10:42 am #

    This helped me so much ! Thank you!

  511. CHRISTINA RIVAS November 11, 2013 at 9:44 pm #

    very thorough, especially the end. thank you

  512. mojo gamer November 12, 2013 at 8:24 am #

    thank you this video really helped me. it was well explained and really
    clear . thanks

  513. Rawdha Alkaabi November 13, 2013 at 9:44 am #

    Thank you a lot , your video saved my life cuz tomorrow I have a test and I
    have to study about blood and other stuff , I didn’t understand that part
    so I looked in YouTube and found you :) thanx again

  514. Roy Chang November 14, 2013 at 6:51 pm #

    Were you aware that “Atrioventricular” in your slides are spelt incorrectly?

  515. trikampiukas November 16, 2013 at 4:37 pm #

    Thanks a lot!! I do fitness and PT course, and I have anatomy class and I
    started circulatory system stuff. At the first class I couldn’t absorb it,
    but now I have a clue how it works:D. Thanks once again for the simple
    explanation!

  516. Kendra Walker November 17, 2013 at 9:32 pm #

    The best !! love this video

  517. al niebs November 19, 2013 at 4:46 pm #

    good vid but it bugs me that you call the inferior and superior vena cava
    the posterior and anterior vena cava…

  518. al niebs November 19, 2013 at 4:47 pm #

    and John Tan there are pulmonary veins on the right and left sides, just
    like the artery extends to both sides, for both the left and right lungs..

  519. Bop Beast December 9, 2013 at 8:47 pm #

    Simply Amazing!! i cant believe i learned all this in 9 minutes when my teacher couldnt teach us in 75!!

    • Leslie Samuel December 10, 2013 at 4:55 pm #

      And I’m glad to hear that the videos are helping you :)

  520. adedayo Clement May 10, 2014 at 1:14 pm #

    pls how do I download these videos I’m a second year medical student and I’m greatly in need of them

  521. Ellena May 28, 2014 at 7:08 am #

    Nice article

  522. Rana Shammas May 28, 2014 at 6:17 pm #

    This is extremely helpful. It helps me to picture it and understand it very well. This video is stuck on my mind. Will never forget the blood flow from now on :) Words can’t thank you enough!!