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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.
Oxygen- Rich blood then returns to the heart via the Pulmonary Trunk which empty into the left atrium. Once the atrium contracts, the blood passes through the Bicuspid Valve into the Left Ventricle. Once the ventricle contracts blood is forced through the Aortic Valve and out of the Aorta to travel to the blood tissue.