Oxygen-rich blood flows from the lungs through the left upper
chamber (atrium) of the heart into the left lower chamber (ventricle) of the
heart. The left ventricle muscle contracts to pump blood out through the
aorta—a large blood vessel carrying blood out of the heart—to the rest of the
Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology & Martin J. Gabica, MD - Family Medicine & Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology
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