(A) The cycle of events which occurs in a single heartbeat is called the cardiac cycle. It involves the contraction and relaxation of the heart muscle

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(A) The cycle of events which occurs in a single heartbeat is called the cardiac cycle. It involves the contraction and relaxation of the heart muscle.$1$. Systole: When blood is ejected from the heart due to contraction.$2$. Diastole: When the chambers of the heart are filled with blood. It is also called relaxation.