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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.
Oxygenated blood (pure blood) is pumped from the lungs to the left atrium, from the left atrium blood is pumped to the left ventricle through the mitral valves (leaflets between the two chambers which prevent back flow of blood). From the left ventricle, blood flows to other parts of the body via aorta (main blood vessel carrying blood from heart).