The rhythmic contraction and relaxation of heart muscles is known as ________.

Exhalation rate

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Breathing rate

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Heart beat

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Inhalation rate

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Solution

The correct option is C
Heart beat

The rhythmic contraction and relaxation of the heart muscles is known as a heartbeat. Each heartbeat consists of a combined contraction of the atria called the atrial contraction (ventricles are relaxed) followed by the combined contraction of the ventricles known as ventricular contraction (atria are relaxed).

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The initiation of the contraction and relaxation of the heart and regulation of the heartbeat rate are carried out by the special muscles of ___.

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