Heart Chambers

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Circulation of blood through the chambers of the heart Septum divides heart into the right and left heart. Each side contains an upper and lower chamber: Atria, or upper chambers, receive blood. Ventricles, or lower chambers, pump blood. Valves control intake and outflow of blood in chambers. Right Atrium Located at the right upper portion of the heart. A thin-walled space that receives blood from the upper and lower parts of the body (except the lungs). Two large veins, superior and inferior venae cavae, bring deoxygenated blood into the right atrium. Right Atrium The blood passes through the tricuspid (atrioventricular) valve and into the right ventricle. Right Ventricle Located at the right lower portion of the heart. Receives blood from right atrium through tricuspid valve. Pressure from RV contracting forces open pulmonary (semilunar) valve. Left and right pulmonary arteries carry blood to lungs. Right Ventricle In the lungs, blood gives up waste, takes on oxygen. Oxygenated blood leaves lungs through left and right pulmonary veins to heart’s left atrium. Left atrium Located at the left upper portion of the heart. Receives blood rich in oxygen as it returns from the lungs via the left and right pulmonary veins. Pressure created by the oxygenated blood in the left atrium forces open the bicuspid (mitral) valve and allows blood to fill left ventricle.

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