Assertion: The normal heart rate is 75beats/min and the cardiac cycle is 0.8sec.
Reason: Cardiac cycle is inversely proportional to the heart rate.
A
If both assertion and reason are false
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B
If an assertion is true but the reason is false
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C
If both assertion and reason are true then the reason is not the correct explanation of assertion
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D
If both assertion and reason are true and the reason is the correct explanation of assertion.
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Solution
The correct option is D If both assertion and reason are true and the reason is the correct explanation of assertion. Correct option: (A) If both assertion and reason are true and the reason is the correct explanation of assertion.
The normal heartbeat is 75 beats per minute, which means a complete cardiac cycle in one minute.
One complete cardiac cycle takes 0.8 seconds.
The ventricle of the heart pumps approximately 70ml of blood; it is called stock volume during a cardiac cycle.