Blood flows through the heart from the atriums to the ventricles. Blood first comes into the heart through the superior and inferior vena cava into the right atrium. The right atrium then pumps the blood through the right AV valve into the right ventricle. From the right ventricle, the blood is pumped into the pulmonary artery to the lungs and back through the pulmonary vein. It enters the left atrium and then is pumped through the left AV valve into the left ventricle. This is the largest chamber of the heart. It pumps the blood to the entire body.
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