What is the role of ATP in muscle contraction and relaxation? A)It is hydrolyzed from the 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 apply.

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ATP plays multiple roles in muscle contraction and relaxation. It is hydrolyzed from the myosin head to attach to actin during crossbridge cycling, and it also powers the Ca2+ pumps that remove calcium ions from the cytosol and return them to the sarcoplasmic reticulum. Additionally, ATP causes detachment of the myosin head from actin, allowing for relaxation of the muscle.

What Is the Role of ATP in Muscle Contraction and Relaxation