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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 blood exchange gases at the lungs' alveoli, and then the blood returns to the heart via pulmonary veins, freshly oxygenated by the alveoli. The pulmonary vein carries the blood to the left atrium, and then the blood is forced into the left ventricle through the mitral valve.lows through the bicuspid valve to the left ventricle. pumped out of the left ventricle through a semi lunar valve into the aorta. branches through series of arteries to all parts of the body. Leaves the body tissues via various veins and re enters the right atrium of the heart via the vena cava.