Question

Asserion(A): At cellular level, muscle fibres contract and show appropriate response on receiving impulses.

Reason(R): Muscle fibres contract because of change of structure of muscle proteins at cellular level.

• A. A & R both incorrect
• B. A is correct, R is incorrect
• C. A & R both are correct
• D. A is incorrect & R is correct

Answer 1

The correct option is C

A & R both are correct

On receiving the electrical impulse, proteins of muscle fibres alter their structure temporarily . When all muscle fibres and their corresponding proteins show similar effect, an overall response is created in the muscle tissue as a whole which is visible as contraction of muscle tissue.