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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.
Diagram showing the flow of blood in the heart. What I just described is one cardiac cycle, or the sequence of events in a single heartbeat. Since the average heart beats about 75 beats per minute, the length of each cardiac cycle is less than one second.