Question

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

• A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
• B. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
• C. If Assertion is correct but Reason is incorrect.
• D. If Assertion is incorrect but Reason is correct.

Answer 1

The correct option is A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

The correct option is A.

Assertion statement :

1. Muscle cells are termed muscle fibres rather than myofibrils because they are very thin and elongated.
2. A myofibril is a striated muscle fibre's basic unit.

Reason statement :

1. A striated muscle fibre is made up of several myofibrils that are organized along the fibre's long axis.
2. Actin filaments and myosin filaments are the two types of myofilaments found in a myofibril.
3. The contraction and relaxation of the muscle fibre are caused by the sliding of these myofilaments over one another.

Final answer: (A) Both assertion and reason are correct and the reason is the correct explanation of assertion.