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From there, the blood leaves the heart through the aorta to be distributed throughout the body. Blood enters the heart through the superior and inferior venae cavae into the right atrium. This blood then flows through the right atrioventricular valve to the right ventricle.
In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid.