What is the role of ATP in muscle contraction and relaxation? A)It is hydrolyzed fro myosin head to attach to actin. B)It causes myosin head to detach from actin. C)It powers the Ca²⁺ pumps to return Ca²⁺ to the SR. D)All of the choices are correct.

Question

Quizplus · Accepted Answer

ATP plays multiple key roles in muscle contraction and relaxation. It is hydrolyzed by the myosin head to attach to actin during contraction and causes the myosin head to detach from actin during relaxation. Additionally, ATP powers the Ca2+ pumps to return calcium ions to the sarcoplasmic reticulum, allowing for relaxation to occur. Therefore, choice D is the correct answer.

What Is the Role of ATP in Muscle Contraction and Relaxation