There to keep blood moving in the right direction. So this is the rightĬhamber of the heart. In the right atrium, it's going to head down And this is a vein, ofĭirections that blood is going to be flowing. And it came into the rightĪtrium from a giant vessel up top called the Name of the chamber that the blood ends up in. It's going to end upĪt the- actually, maybe I'll draw it here- isĮnding up at the right atrium. In this way and blood coming in this way is ending Mention the word artery, I want you to think of blood There are definitely some parallels between how Of goes down, down, down and splits like that. To the arm, one vessel up this way, a vessel And the aorta actually hasĪ little arch, like that. Is pumped by the heart, it's going to have to Mention the word vein, I just want you to With veins from the belly, coming into another You've got veins from the legs meeting up The two arms and the head, are going to come together Up from this arm, let's say, and dump into there. Of all, and then get pumped back out to the body. Parts of their body, including their legs,Ĭan make its way back to the heart, first And this is their face,Īnd this is their neck. Because it starts pumping bloodįrom the point where you're a little fetus, maybeĪbout eight weeks old, all the way until the It the hardest working organ in our body. And you can see the vesselsĬoming into it and out of it. And it's shown withĪll the vessels on it. One of the most amazing organs in your body. These two factors take away from the "bulge" argument.Īs of right now, I do not believe there is an answer to your question, but it definitely has to do with fetal development and early fetal circulation. My second problem is that the ductus arteriosis and the high resistance in the lungs limits the blood returning to the atrium via the pulmonary vein. I think the assumption is not grounded in any facts, but speculation. It seems that an assumed premise is both the tricuspid valve and mitral valve start out with three leaflets. I think there were two problems with this. This bulging forces two leaflets of the proliferating cell to join and form one leaflet The excess blood in the left atrium forces it to bulge to make room for excess blood Blood joins the left atrium from the regular sources (pulmonary veins) and also from the right atrium. During embryonic development pressures are higher in the right side of the heart than the left I only found one theory that makes some sense. I thought this was a really interesting question, and I did a little bit of research. The other valves are meant to be more easily opened so that blood can easily be pushed out of the heart. This means that there needs to be a reliable barrier between the Atrium and Ventricle which is why there are three flaps. So when the blood initially flows into the heart, it needs to be stopped in the Atrium and the Ventricle before being pushed out of the heart. The way these valves open is because the blood is literally being forced out of the Ventricle, and this is the main reason why they are different in structure. They have fibrous "strings" attached to the back so they can only open in one way. This is the same principle as the semi-lunar valves. However, you are not able to open the door in the opposite direction because the hinge will not allow the door to swing that way. With the turn of a knob, you are able to open that door and walk in. To help envision this, imagine that you have a hinged door on the wall. These two valves are called this because they have two flaps of skin that can only open in one direction, again to prevent backflow. The other valves, the Pulmonary and Aortic valves are semi-lunar valves. Since they have three flaps of skin, they are called TRIcuspid (easy to remember). Imagine three flaps of tissue that come together to form a seal so that there is no back flow of blood. The Tricuspid valves (also called the atrioventricular valves) have a three flap design. This is a good question and in short the answer is no.
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