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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.
Overview. The left atrium is the chamber of the heart that receives oxygen-rich blood from the lungs. Blood moves from the left atrium, through the mitral valve, into the the main pumping chamber of the heart--the left ventricle, and then out to the body.Any condition that increases pressure in this portion of the cardiac system can lead to enlargement of the left atrium.verview. The left atrium is the chamber of the heart that receives oxygen-rich blood from the lungs. Blood moves from the left atrium, through the mitral valve, into the the main pumping chamber of the heart--the left ventricle, and then out to the body.