Question

Contraction cycle of muscle showing four parts of muscle twitch. Find out correct sequence.

• A. (i) Latent period, (ii) Relaxation period, (iii) Refractory period, (iv) Contraction
• B. (i) Contraction, (ii) Latent period, (iii) Relaxation period, (iv) Refractory period.
• C. (i) Latent period, (ii) Contraction, (iii) Relaxation period, (iv) Refractory period
• D. (i) Refractory period, (ii) Relaxation period, (iii) Latent period, (iv) Contraction

Answer 1

The correct option is C (i) Latent period, (ii) Contraction, (iii) Relaxation period, (iv) Refractory period

1. Latent period of muscle: The delay / gap between the receipt of a stimulus by a sensory nerve and the response to it is called latent period.

2. Contraction period: During this period the muscle undergoes depolarization and it starts contracting.

3. Relation period: It is the period during which the muscle relaxes as the stimuli is stopped or moves away.

4. Refractory period: It is the period that follows stimulation during which the muscle becomes unresponsive to the further stimulation.

So the correct option is C.