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Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. Left Side. Oxygen-rich blood returns from the lungs to your heart's left atrium through the pulmonary veins.he mitral valve does this between the left atrium and ventricle. The lub is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles has an outlet valve. The right ventricle uses the pulmonary valve to help move blood into the pulmonary arteries.
The oxygen-rich blood returns to the heart through the left atrium and then passes into the left ventricle. From the left side of the heart, blood is pumped through the main artery of the body (aorta) and circulated to all the arteries for use by the body. Between the chambers of the heart are valves that open and close. These valves allow the chambers to fill and empty, helping the blood to flow in one direction.