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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.
Blood returns to the heart from the lungs via the pulmonary veins. The blood goes into the left atrium. When the left atrium contracts, blood travels through a valve into the left ventricle.The left ventricle is a very important chamber because it pumps blood through a valve and into the aorta. The aorta-the main artery of the body-receives all the blood that the heart pumps out and sends it to the rest of the body.lood returns to the heart from the lungs via the pulmonary veins. The blood goes into the left atrium. When the left atrium contracts, blood travels through a valve into the left ventricle.