'X' is the rhythmic contraction and relaxation in the aorta and its main arteries. What is X?

Heart beat

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Heart rate

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Pulse

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Cardiac output

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Solution

The correct option is C Pulse
C. Pulse
Reason: Pulse is the rhythmic contraction and relaxation in the aorta and its main arteries. Thus pulse is a wave of increase that passes through arteries as the left ventricle pumps its blood into the aorta. Pulse is a regular jerk of an artery.

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

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