Blood flows throughout the body in order to supple the organs with nutrients and oxygen. In order for that to happen the blood has to be pumped. The heart does the pumping of the blood to ensure the organs receive the blood. Blood enters the heart through the superior vena cava and the inferior vena cava. From the vena cava the blood flows into the right atrium. There is a right atrioventricular valve that is between the right atrium and the right ventricle to prevent the blood from flowing into the ventricle. When there is enough pressure in the right atricum the right atrioventricular valve opens and the blood rushes into the right atrium. In order from the blood to get oxygenated the blood then leaves the right ventricle by the pulmonary semilunar valve which directs the blood to the pulmonary trunk. The pulmonary trunk leads the blood to the lungs where the blood is oxygenated. From the lungs the blood enters the right and left pulmonary veins into the left atrium. There is a left atrioventricular valve that prevents the blood in the atrium from flowing into the ventricle. When there is enough pressure built up by the blood in the left atrium the left atrioventricular valve opens and blood flows into the left ventricle. From the left ventricle the blood flows through the aortic semilunar valve and into the ascending aorta. From the aorta the blood goes to all parts of the body.
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