Rhythmic contraction and relaxation of heart muscles is known as:

Heart beat

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Heart defect

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Heart attack

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Heart disease

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Solution

The correct option is A Heart beat
The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. This rhythmic contraction followed by its relaxation constitute a heartbeat. A normal resting heart rate for adults ranges from 60 to 100 beats per minute.

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

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