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Acorn's Animations. Alarm Clocks. April Fool's. Birthday Cakes. Each valve has flaps, called leaflets or cusps, that open and close once during each heartbeat. In the beginning of a pumping cycle, oxygen-poor blood, shown here as blue, returns to the heart after circulating through your body. The oxygen-poor blood fills the right atrium and then flows to the right ventricle, where it is pumped to the lungs through the pulmonary arteries. The lungs refresh the blood with a new supply of oxygen, which comes from the air that you breathe in.
The now oxygen-rich blood, shown in red, then returns from the lungs and enters the left atrium. The oxygen-rich blood then flows from the left atrium to the left ventricle. The blood is then pumped through the main artery that supplies blood to the body, called the aorta, to supply tissues throughout your body with oxygen.
Your heart is nourished by blood, too. Oxygen-rich blood is delivered by coronary arteries that extend over the surface of your heart. A beating heart contracts and relaxes. Contraction is called systole, and relaxation is called diastole. During systole, your ventricles contract, forcing blood into the vessels going to your lungs and body. Your ventricles then relax during diastole and are filled with blood coming from the upper chambers, the left and right atria.
Then the cycle starts over again.
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