Question

Contraction cycle of muscle showing four parts of muscle twitch is given. Find out the 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

• The contraction generated by a single action potential is called a muscle twitch.
• A single muscle twitch has three components.
• The latent period, or lag phase, the contraction phase, and the relaxation phase. Hence, Contraction cycle of muscle showing four parts of muscle twitch is an i-latent period, ii-contraction, iii-relaxation period, iv-refractory period.

So, the correct answer is 'i-latent period, ii-contraction, iii-relaxation period, iv-refractory period'.