what is normal cardiac cycle time
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The duration of the cardiac cycle is the reciprocal of heart rate. Assuming a heart rate of 75 beats per minute, each cycle takes 0.8 seconds . The rhythmic contraction (systole) and relaxation (diastole) of the chambers of the heart that corresponds to one heartbeat. During the cardiac cycle, blood is pumped out of the heart into the aorta and the pulmonary artery, and blood reenters the heart from the venae cavae and the pulmonary veins.
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