A) Hydrolysis of ATP by myosin energizes the cross-bridges, providing the energy for force generation.
B) Binding of ATP to myosin dissociates cross-bridges bound to actin, allowing the bridges to repeat their cycle of activity.
C) Hydrolysis of ATP by the \[C{{a}^{2+}}\]-ATPase in the sarcoplasmic reticulum provides the energy for the active transport of \[C{{a}^{2+}}\] into the reticulum, lowering cytosolic \[C{{a}^{2+}}\] to pre-release levels, ending the contraction and allowing the muscle fiber to relax.
D) All of the above.
Correct Answer: D
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