Which of these activities is involved in the process of muscle relaxation

Question

Quizplus · Accepted Answer

During muscle relaxation, Ca²⁺ ions are actively taken up by the lateral sacs of the sarcoplasmic reticulum when there is no longer a local action potential. This allows the tropomyosin to block the active sites on the thin filaments, preventing the cross-bridges from forming and causing muscle contraction. 
 
The other options are not involved in the process of muscle relaxation. A is involved in allowing the muscle membrane to return to resting potential but is not directly involved in muscle relaxation. C is describing the process of muscle contraction, not relaxation. D is not a valid option as ATP is necessary for muscle relaxation as it is required for the active transport of Ca²⁺ ions back into the sarcoplasmic reticulum.

Which of These Activities Is Involved in the Process of Muscle