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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.
On the left side, oxygen-rich blood from the lungs goes into the left atrium. When it is full, the atrium contracts, a valve opens, and the blood is sent into the left ventricle. Another valve allows the blood to flow into the aorta, the largest artery in the body. From there, the blood goes to all parts of your body.