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(B) During muscle contraction,the cross-bridge formation between actin and myosin filaments occurs when $Ca^{2+}$ ions bind to troponin,exposing the a

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$ATP$ presence $\quad$ $ATP$ absence

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(B) During muscle contraction,the cross-bridge formation between actin and myosin filaments occurs when $Ca^{2+}$ ions bind to troponin,exposing the active sites on actin. This step does not require $ATP$ hydrolysis directly.However,the breaking of the cross-bridge (detachment of the myosin head from actin) requires the binding of a new $ATP$ molecule to the myosin head. The hydrolysis of this $ATP$ then provides the energy for the myosin head to return to its 'cocked' position.Therefore,cross-bridge formation occurs in the presence of $Ca^{2+}$ (but does not require $ATP$ for the binding itself),while cross-bridge breaking strictly requires the presence of $ATP$.

Select the correct option for the following processes in muscle contraction:
Cross-bridge formation $\quad$ Cross-bridge breaking

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Select the correct option for the following processes in muscle contraction:Cross-bridge formation $\quad$ Cross-bridge breaking