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

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

Body Fluids and Circulation

Solution:

Pulse is the rhythmic contraction and relaxation in the aorta and its main arteries. It is a regular jerk of an artery. It is same as the heart rate because an artery pulses every time the heart beats.