The first event to occur in muscle relaxation is:
A) tropomyosin returns to its original position.
B) myosin cross-bridges are prevented from binding to actin.
C) the sarcoplasmic reticulum begins actively pumping calcium back into its sacs.
D) acetylcholine is released.

Question

Quizplus · Accepted Answer

The sarcoplasmic reticulum begins actively pumping calcium back into its sacs, which leads to a decrease in the concentration of calcium ions in the cytoplasm. This decrease in calcium concentration is necessary for muscle relaxation to occur.

The First Event to Occur in Muscle Relaxation Is