atrium of the heart


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atrium of the heart

one of the two upper chambers of the heart. The right atrium receives deoxygenated blood from the superior vena cava, the inferior vena cava, and the coronary sinus. The left atrium receives oxygenated blood from the pulmonary veins. Blood is emptied into the ventricles from the atria during diastole.

atrium of the heart

The upper chamber of each half of the heart. The right atrium receives deoxygenated blood from the entire body (except lungs) through the superior and inferior venae cavae and coronary sinus; the left atrium receives oxygenated blood from the lungs through the pulmonary veins. Blood passes from the atria to the ventricles through the atrioventricular valves. In the embryo, the atrium is a single chamber that lies between the sinus venosus and the ventricle.
See also: atrium
References in periodicals archive ?
Over the next four hours the surgeon implanted the artificial heart into the diaphragm on the side of Julie's chest and attached it to the left atrium of the heart and the aorta - the main artery leaving the heart.