Assertion :Skeletal muscles contract most quickly and also get fatigued that quickly. Reason: They have limited supply of energy.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Skeletal muscle contains muscle fibers, composed of myofibrils. They are made up of sarcomeres which have myosin and actin filaments. The rapid contractions in the skeletal muscles occur due to the voluntary signals to the motor neuron which innervates the muscle fibers. There are fast glycolytic muscle fibers which do not contain much myoglobin nor can store much oxygen and hence runs out of its ability to produce ATP. This limited supply of energy leads to quick fatigue due to the accumulation of the lactic acid in the muscles.
Thus, the correct answer is option A.

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