Which of the following is involved in muscle relaxation?

Question

Quizplus · Accepted Answer

During muscle relaxation, acetylcholinesterase removes ACh from the synaptic cleft, which stops the transmission of the action potential. As a result, the muscle cell membrane returns to its resting potential.

Also, Ca₂₊ is actively taken up by the sarcoplasmic reticulum, specifically by the lateral sacs. This reuptake of Ca₂₊ decreases the cytoplasmic Ca₂₊ concentration and prevents further myosin-actin interaction, leading to muscle relaxation.

Therefore, both options A and B are involved in muscle relaxation, and the correct answer is D, "Both a and b." Option C is not correct because this step occurs during the contraction phase, not relaxation.

Which of the Following Is Involved in Muscle Relaxation