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Blood that has traveled around the body – dropping off oxygen and nutrients and picking up waste products – returns to a receiving chamber of the heart called the RIGHT ATRIUM. Blood then travels through the TRICUSPID VALVE into the RIGHT VENTRICLE. When the heart contracts the RIGHT VENTRICLE ejects the blood through the PULMONARY VALVE into the PULMONARY ARTERIES and the lungs. In the lungs the blood drops off CO2 and picks up oxygen. The oxygen rich blood then returns to the receiving chamber of the heart called the LEFT ATRIUM.
Blood then travels through the MITRAL VALVE to the LEFT VENTRICLE. When the heart contracts the LEFT VENTRICLE ejects the oxygen rich blood through the AORTIC VALVE into the AORTA and out to the whole body.
While the heart functions to pump blood to the lungs and body, the heart muscle itself also requires blood to supply its oxygen and nutrients. This blood comes from the CORONARY ARTERIES. Blockages in these arteries (or ‘coronary artery disease’) cause chest pain, angina and heart attack.