Assertion :
Muscle cells are also called myofibrils.
Reason:
Muscle cells are very thin and elongated.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Since muscle cells are very thin and elongated, therefore, they are also called as muscle fibres and not myofibril. Myofibril is the unit of a striated muscle fibre. A striated muscle fibre is composed of many myofibirils arranged along the long axis of the fibre. A myofibril is of two types of myofilaments-actin filaments and myosin filaments. Sliding of these myofilaments over one another cause the contraction and relaxation of the muscle fibre.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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