The heart contracts and relaxes rhythmically. During diastole of the cardiac cycle
Chapter 23, Problem 23.4(choose chapter or problem)
The heart contracts and relaxes rhythmically. During diastole of the cardiac cycle, blood flows from the veins into the heart chambers; during systole, contractions of the atria push blood into the ventricles, and then stronger contractions of the ventricles propel blood into the large arteries. Cardiac output is the amount of blood per minute pumped by a ventricle. Heart valves prevent the backflow of blood.
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