Cardiac cycle is a cyclic event that occurs in

single heartbeat

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double heartbeat

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atrium

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ventricle

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Solution

The correct option is A single heartbeat
A cardiac cycle is a cyclic event that occurs in one single heartbeat.
It is the movement of the blood from the right side of the heart to the lungs where it gets oxygenated and then again to the left part of the heart and then to the entire body through the aorta. It takes 0.8 sec to complete one cardiac cycle.
Hence, the correct answer is 'single heartbeat'

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