episode44

044 How Blood Flows Through the Heart

Leslie Samuel IBTV, Physiology, The Circulatory System 528 Comments

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.

Comments 528

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  1. Shrikharan

    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.

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  2. InteractiveBiology

    @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! :)

  3. issayk1

    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

  4. issayk1

    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

  5. XSymphony

    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

  6. InteractiveBiology

    @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!

  7. tokohgraduan2009

    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.

  8. anserhasan

    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.

  9. anserhasan

    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.

  10. anserhasan

    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.

  11. Angela Lawlor

    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!

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      Author
  12. experience271

    @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…

  13. experience271

    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…

  14. Livia S.

    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!

  15. ProfRoofs

    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.

  16. arnettejm

    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!!!

  17. jdillla93

    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 !

  18. mara danni

    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 !!

  19. Anonymous

    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 !!

  20. Isabellesweeps

    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.

  21. athisulu777

    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

  22. MrBleather

    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?

  23. GarciaAllyrianne

    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

  24. mariedoubledee

    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!

  25. mariedoubledee

    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!

  26. iloveyouboyyyyy

    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!!

  27. sassinebernadette

    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.

  28. Dechen

    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

  29. nishacat03

    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 :)

  30. Jessica

    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

  31. gizmokeeper

    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.

  32. gizmokeeper

    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.

  33. SaiThel21

    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. :)

  34. SaiThel21

    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. :)

  35. zmerka1

    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.

  36. zmerka1

    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.

  37. zmerka1

    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.

  38. dbscout

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

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  40. mrtherock60

    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.

  41. 1summersday

    “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….

  42. sciencemusicvideos

    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.

  43. Pamela Price

    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.

  44. dollface0itm

    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 :)

  45. dilwilhan1116

    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!!!

  46. Dakota Bridges

    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.

  47. Sweetergrass

    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…..

  48. nicole carrier

    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!

  49. dianafavela1

    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 !!

  50. amromi

    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.

  51. Happy30Too

    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.

  52. Happy30Too

    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.

  53. sexylegs718

    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…

  54. 0113slimshady

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

  55. lilprincessliza

    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!!

  56. Jeph Baculina

    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

  57. MustafaQ93

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  58. Sarah Alkaj

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

  59. fighting1rish

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

  60. OriginalRipndip

    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?

  61. Nada Kazzaz

    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

  62. Erin3085

    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.

  63. Sara Chequer Costa

    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!

  64. Lladira NZ

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

  65. Deyan Dachev

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

  66. Shaletail

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

  67. Kaeldannas

    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.

  68. Nikita Rusov

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  69. Ams Babz

    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

  70. MrsCansu

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

  71. RaithelBR

    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.

  72. RaithelBR

    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.

  73. Cindy Le

    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. ^^~

  74. lithiumkc8

    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

  75. Glowing4Life

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

  76. iamablond99

    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!

  77. Charl Charlie

    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!

  78. Kristen Link

    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!

  79. Ann Pham

    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

  80. lithiumkc8

    visit my channel to see the video Time to pay up, Timmy!
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  81. saraharnone1

    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!

  82. Luv2Shop313

    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.

  83. Katie Rundzieher

    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.

  84. RadhaSyam108

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

  85. RadhaSyam108

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

  86. roxes deniega

    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…

  87. vanessa moore

    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!

  88. Ummi YusufwaDawud

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

  89. Anand Tapadar

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

  90. vidura rodrigo

    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!!!

  91. Preston Vo

    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..

  92. jasmine nana

    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”,)

  93. hunger4jsutice

    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.

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    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!

  95. NAZARET957

    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!!!

  96. Paulina

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

  97. abhinav omprakash

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

  98. Odiyanaa Ravi Swamukth

    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…

  99. Jan Amber Rose

    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.

  100. FRANCISCA NZEKWE

    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

  101. Lex

    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!

  102. kalpesh patel

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

  103. alex biocanin

    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)…

  104. alex biocanin

    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)…

  105. moniquedaleymd

    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

  106. sarah loutzenhiser

    Wow this is amazing! You make it easy to understand =) I will be watching more of your videos as I travel through my classes!

  107. Katherine Astaneh

    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.

  108. Rawdha Alkaabi

    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

  109. trikampiukas

    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!

  110. al niebs

    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..

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      Author
  111. adedayo Clement

    pls how do I download these videos I’m a second year medical student and I’m greatly in need of them

  112. Rana Shammas

    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!!

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