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(C) Muscle contraction requires energy in the form of $ATP$ (Adenosine Triphosphate).When a muscle fiber is stimulated,$ATP$ binds to the myosin head,

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$ATP$

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(C) Muscle contraction requires energy in the form of $ATP$ (Adenosine Triphosphate).When a muscle fiber is stimulated,$ATP$ binds to the myosin head,which is then hydrolyzed to $ADP$ and inorganic phosphate $(\Pi)$ to provide the energy required for the power stroke.While creatine phosphate acts as a storage form of high-energy phosphate to rapidly regenerate $ATP$,$ATP$ itself is the direct and immediate molecule used by the myosin heads to facilitate the sliding filament mechanism.

The immediate source of energy for muscle contraction is ...... .

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