![]() 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. The left atrium contracts sending the blood through the left atrioventricular valve into the left ventricle. Once the blood gets oxygen aided, it leaves the lungs and goes via the pulmonary veins into the left atrium. Once the blood goes to the lungs, it picks up, you guessed it, oxygen because you’re breathing in the oxygen. And, it goes also in this direction to the lungs. And from here, that blood goes to the lungs. 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. As it enters into the right atrium, the atrium contracts and that pushes the blood into the right ventricle. Blood is coming in, entering into the right atrium. We have the posterior vena cava and we have the anterior vena cava. So, you can see blood is flowing into the vena cava. Now that we know the different valves, let’s look at how blood flow happens.īlood comes back from the body and it enters into the heart via the vena cava. They allow for blood to flow in one direction. So, all of these valves are one-way valves. If it tries to flow back, these valves are going to shut. ![]() So, here you can see blood can flow into the ventricle but, it can’t flow back. The special thing about valves is that it allows for blood to flow in one direction. Those are the valves that I want you to be familiar with. 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. We call it the aortic valve because it leads into the aorta. On the left, we have this semilunar valve which we can also call the aortic valve. The reason it’s called a pulmonary valve is because it leads into the pulmonary artery. On the right side, we have the right semilunar valve and that is also called the pulmonary valve. Then, we have valves that allow blood to leave the ventricles. So, we have the tricuspid or the right atrioventricular valve and the bicuspid or the mitral or the left atrioventricular 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. 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. You’re only seeing two here but, that’s because this is a cross-section. We call it “tricuspid” because it has three cusps, in other words, three flaps. Now, on the right side, we also call this atrioventricular valve a tricuspid valve. So, here we have an atrioventricular valve, here we have an atrioventricular valve. And that makes sense since it’s between the atria and the ventricle. The next thing I want to point out is that between the atria and the ventricles, we have what we call the atrioventricular valve. Same thing over here, we have the right ventricle, left ventricle right atrium and left atrium. Then, we have the right ventricle and the left ventricle. The first thing I want to point out is here, we have the right atrium and the left atrium. There are a number of parts of the heart that we need to know. There are a number of valves that are found throughout the heart. This would be his right side and this would be the left side. But, this is looking at it as an individual that’s facing you. Now, that looks a little strange because when you’re looking at the screen, this is your left and this is your right. ![]() Over here, we have the left side of the heart. First of all, allow me to point out that this is the right side of the heart so, this is right. ![]() 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. We’re going to look at a number of details here just to give an overview of how the blood flows through the heart. On the right, we’re looking at the heart when it’s pumping the blood out of the heart. On your left, we’re looking at the heart when it’s being filled with blood. Here, we are looking at two pictures of the heart. ![]() This is going to be the first video in the Circulatory System series. 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. ![]()
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