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
To pump the blood into blood vessels, heart regularly contracts and relaxes in a rhythmic manner. It is known as ‘heart beat’.

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

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