The Circulatory System Quiz

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This quiz covers topics about the circulatory system. Have fun!

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Question 1

Non-oxygenated blood passes through what valve into the pulmonary artery to pick up oxygen?

	pulmonary valve
	aortic valve Hint: This valve allows oxygenated blood to flow from the left ventricle to the aorta. I know this alls ounds confusing but, you’ll get used to it :) Try another one.
	tricuspid valve Hint: This valve allows non-oxygenated blood to flow from the right atrium down to the right ventricle. Try another one. I know you’ll get it this time.
	bicuspid valve Hint: This blood allows oxygenated blood to flow from the left atrium down to the left ventricle. You have to think a little harder :)

Question 1 Explanation:

Excellent! The pulmonary valve allows blood to flow from the heart to the pulmonary arteries and into the lungs. For a complete pathway description of blood flow in the heart, you can review this video.

Question 2

After being oxygenated, blood leaves the lungs through the ____________ into the left atrium.

	pulmonary vein
	pulmonary artery Hint: Blood passes through the pulmonary arteries before ot goes to the lungs for oxygenation. Try another one.
	right atrium Hint: The right atrium contracts to pump blood down to the right ventricle through the tricuspid valve. This is really confusing but, I know you’ll get the right one this time.
	left atrium Hint: The left atrium contracts to pump non-oxygenated blood to the lungs through the pulmonary valve. Hmmm... The blood still has to go a long way before it gets oxygenated... Pick another one, please.

Question 2 Explanation:

Exactly! Blood takes up oxygen in the lungs and has to go back to the heart via the pulmonary veins. The heart will then pump the oxygenated blood back to the different parts of the body. To see a more detailed description of this pathway, you can review and go back to watch this video.

Question 3

Oxygenated blood flows from the heart to the rest of the body via the ________.

	aorta
	pulmonary vein Hint: After being oxygenated, blood leaves the lungs through the pulmonary vein into the left atrium. Try again.
	pulmonary artery Hint: This is where the blood passes before it goes to the lungs for oxygenation. Try another one.
	right atrium Hint: The right atrium contracts to pump blood down to the right ventricle from the right atrium through the tricuspid valve. This is really confusing but, I I’m confident you’ll get it this time.

Question 3 Explanation:

Perfect! For more details on how blood flows, you can refer to this video.

Question 4

Blood enters the heart through the _______________.

	vena cava
	right atrium Hint: The right atrium contracts to pump blood down to the right ventricle from the right atrium through the tricuspid valve. This is really confusing but, I’m confident you’ll get it this time.
	pulmonary veins Hint: After being oxygenated, blood leaves the lungs through the pulmonary vein into the left atrium. I know you can do better than this.
	aorta Hint: This one sends blood away from the heart. You have to think harder.

Question 4 Explanation:

Good job! You can review about how blood flows in the heart by reviewing this video.

Question 5

What is the main function of the heart?

	pumps blood to the body via the blood vessels
	to oxygenate blood Hint: This is a function of the lungs. Try again.
	to de-oxygenate blood Hint: Not at all. Think a little harder. I know you’ll get it this time.
	to spread signals to the blood Hint: Definitely not. I know you can do better than that.

Question 5 Explanation:

I knew you’d get this right. The heart pumps the blood to and from the different parts of the body and into the lungs for oxygenation. You can view more about the heart in this episode.

Question 6

Which part of the heart functions as the main pacemaker of the heart?

	sinoatrial node
	atrioventricular node Hint: Oops! Try again. You got it all mixed up.
	semilunar valve Hint: No, not this one. This ensures that the blood flows in one direction inside the heart.
	Purkinje fibers Hint: These spread signals throughout the ventricles that allows the heart to contract in a coordinated fashion.

Question 6 Explanation:

You got it right! The S.A. node have a significantly higher conductance for sodium so it continuously depolarizes causing that impulse that causes the heart to beat. More of this is explained in this video.

Question 7

What hormone is released from the adrenal glands that causes an increase in heart rate during stressful situations?

	adrenaline
	acetylcholine Hint: This hormone’s effect slows down the heart rate. So, we’re looking for a hormone that increases it.
	thyroid stimulating hormone Hint: Although this increases heart rate too, this hormone is released not from the adrenal glands but, from the pituitary gland.
	gastrin Hint: These hormones are found in the stomach.

Question 7 Explanation:

I knew you’d find this easy! When adrenaline is released, that causes the conductance in the pacemaker cells to increase for sodium and calcium ions causing them to rush into the cell much faster. This creates a faster action potential with signals being produced much faster and the heart rate increases. More of this can be seen in this video.

Question 8

Which fibers extend from the A.V. node and spread throughout the ventricle?

	Purkinje fibers
	chordae tendineae Hint: These are actually tendons that connect papillary muscles to the atrioventricular valves of the heart. Give it another try. You’ll probably get it this time.
	papillary muscle Hint: These are muscles found in the ventricles of the heart. We’re looking for fibers that are somehow connected to the AV node.
	S.A. node Hint: No, you got to try once again.

Question 8 Explanation:

These fibers are important in that they spread signals throughout the ventricles that allows the heart to contract in a coordinated fashion. You can watch more of this in this video.

Question 9

Why is there a delay in blood flow after it passes the AV node and then significantly increases conductance velocity as it passes through the Purkinje fibers?

	To avoid atria and the ventricles from contracting at the same time.
	To wait for more blood so they can be pumped all at the same time. Hint: Not at all. Come on, I know you can do better than that.
	To allow blood to get more oxygen. Hint: Try harder. I know you’ll get it this time :)
	To allow for the valves to rest as not to overuse them in the pumping of blood. Hint: Pick a better guess. :)

Question 9 Explanation:

You’re good! For more on this, watch this video.

Question 10

What parts of the heart are numbered below?

	S.A. node and A.V. node, respectively.
	Right atrium and right ventricle, respectively. Hint: They receive non-oxygenated blood and pumps it into the other side of the heart.
	Atrioventricular valve and right ventricle, respectively. Hint: These regulates flow of blood to the other side of the heart.
	S.A. node and Purkinje fibers, respectively. Hint: You’ve got one of them right. Try again. I’m sure you’ll get it this time.

Question 10 Explanation:

Wow! You must be an anatomy expert! These special group of cells control electrical impulses in the heart. To know more about it’s role, you can go back and view the video here.

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The Circulatory System Quiz

The Circulatory System Quiz

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