What is the contraction of the heart called?

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(A) The rhythmic contraction and relaxation of the heart constitute the cardiac cycle. $1$. The contraction phase of the heart,specifically the ventri

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Systole

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(A) The rhythmic contraction and relaxation of the heart constitute the cardiac cycle. $1$. The contraction phase of the heart,specifically the ventricles or atria,is known as $Systole$. $2$. The relaxation phase of the heart is known as $Diastole$. Therefore,the contraction of the heart is called $Systole$.

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