Question

The rhythmic contraction and relaxation of the heart muscles is known as _____________ .​

Answer 1

Answer:

diastole

Explanation:

This process is called the cardiac cycle. The period of relaxation is called diastole. The period of contraction is called systole. Diastole is the longer of the two phases so that the heart can rest between contractions.

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Answer 2

Answer:

Cardiac cycle

Explanation:

The cardiac cycle is the rhythmic contraction and relaxation of the heart. Contraction is called cardiac systole and Relaxation is called cardiac diastole. Both contraction and relaxation are together known as the cardiac cycle.