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Question

Assertion: Repeated stimulation results in fatigue in voluntary muscles.
Reason: It occurs because of unavailability of ATP.

A
Both assertion and reason are correct statements and reason is the correct explanation to the assertion
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B
Both assertion and reason are correct statements and reason is an incorrect explanation to the assertion
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C
Only assertion is correct
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D
Both assertion and reason are incorrect
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Solution

The correct option is A Both assertion and reason are correct statements and reason is the correct explanation to the assertion
Constant activation or stimulation of voluntary muscles (skeletal muscles) leads to a decline in the amount of available ATP. This is then replenished by anaerobic and aerobic respiration. Evetually, if the constant stimulation continues, the rate of ATP production by respiration cannot cope with the requirements in the muscles. This results in fatigue.

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