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During open-heart surgery the first heart structure that would be cut into is the myocardium left atriumright ventricle left ventriclepericardium...

Question

During open-heart surgery the first heart structure that would be cut into is the myocardium left atriumright ventricle left ventriclepericardium

During open-heart surgery the first heart structure that would be cut into is the myocardium left atrium right ventricle left ventricle pericardium



Answers

Freshly oxygenated blood is first received by the (a) right atrium, (b) left atrium, (c) right ventricle, (d) left ventricle.

Okay, so we want to know which chamber of the heart is going to perceive oxygenated blood on and so we can look at the the heart here, and I've already labeled the chambers for you. Hopefully you're familiar with those already on. We're looking at the anterior portion of the heartens. That's like if you were looking at somebody face on versus looking at them from the back, So this is actually going to be the right side, and then this is going to be the left side of the heart. So two questions that we need to answer to figure out this question, we need to know which chambers the atria or the ventricles, which chambers of the heart actually received blood. And we also need to know which side of the heart is going to be receiving oxygenated blood versus receiving de oxygenated blood. And so when we go into that first question, which chambers of the heart received blood, the easiest way for me to think about this it's just look at the diagram and you can come look at the size of these chambers. So he had the atria up here and in the ventricles down below and you can see pretty clearly that the atria have much thinner walls. The's ventricles down here, much thicker walls. They're really thick, muscular layers. That muscle is necessary to actually pump blood out of the heart to the entire body, whereas the atria are just receiving blood. And that's fairly passive, so they don't really need very thick muscle layer. And so, which timbers of the heart are We have received blood That is going to be the Atria. All right, so the for the second part of this question, which side of the heart receives oxygenated blood? Well, the easiest way looking at this diagram is just kind of base it off of the color of these vessels that we see. We have red and blue vessels, red and blue vessels. Blue means de oxygenated or they don't have any oxygen in that blood that they're carrying in. The red vessels are oxygen rich, And so if we think about this the oxygenated blood, it's going to be coming from the lungs. The de oxygenated blood is going to be coming back from our body, where our body has already used up all the oxygen and just going back to the heart to get more oxygen, to do the same cycle all over again. And so the superior and inferior vena cave A here are going to be bringing blood back from the body that is oxygen poor. It is going to if you just kind of follow that track, it's going to be dumping blood into the right atrium. And so then the left atrium. These vessels are kind of small. They have on each other heart. Here we have thes pulmonary veins that are bringing blood back from the lungs into the left atrium. And so which had the heart receives oxygenated blood has to be that left side that is coming back from the lungs. So that means that question it's going to be the left atrium that is receiving oxygenated blood.

Okay, so we want to know which chamber with heart receives oxygenated blood. And so there's really two parts to this question. First of all, which chambers of the heart received blood versus pumping blood out of the heart and in which side of the heart receives oxygenated blood. Eso, In my opinion, it's easy, especially when you're looking at a diagram of have that in front of you to see that there are red blue vessels and so the blue vessels are going to represent de oxygenated bloods. You can clearly see that the right side of the heart receives de oxygenated blood, and it's also pretty easy to remember Atria versus ventricles. Which ones received blood versus which ones pump it. The ventricles on the bottom here have really, really thick, muscular walls which is necessary for them to push blood out of the heart to pump blood out toe overcome. You know the pressure of needing to get out of the heart and into the rest of the body. So which chambers of the heart received blood that is going to be the atria and in which side of the heart receives oxygenated blood that is going to be the left side of the heart on. And so these four vessels and you can kind of see on the back side of the heart, it's kind of hard to see them, but these are the pulmonary veins, so they've just come back from the lungs and are carrying oxygenated blood, and we'll empty them into left atrium, they contend flow Glickman flow down into the left ventricle to push blood oxygenated blood out into the body.

Myocardial is thickest. In which chamber a the left atrium be the left ventricle. See a writer from Woody for right ventricle. So the thickness of the cardiac muscle is going to be related to be power it comports out on. And that power is going to be related to be pressure, it can put blood under. So the answer here is be a chamber of the heart which we want to give the the highest low pressure. And, yes, that is be the left ventricle because the left ventricle feeds into the aorta on the systemic circuit. This is where the blood isn't the highest pressure. So it has for most powerful contractions with knees, thickest muscle.

So this is a pretty simple, just memorization question, and it's asking blood. Returning to them 1,000,000 heart in a pulmonary vein drains first into the and from your textbook. You should know that the answer is a left atrium.


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