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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.
Report Abuse. The blood leaves the heart to re-enter circulation through the left ventricle. However all chambers play a part in pumping blood through the body. See this website ...you may find it helpful. http://www.botany.uwc.ac.za/SCI_ED/grade...