Which of the following can be an indication of contraction and relaxation of the heart?

Heart beat

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Pulse rate

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Breath rate

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Heart beat and pulse rate

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Solution

The correct option is D Heart beat and pulse rate
Heart beat is defined as a complete cycle of cardiac muscle contraction and relaxation. The pulse rate is a measurement of heart rate, or the number of times the heart beats per minute. Hence both indicate contraction and relaxation of heart.

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