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(B) During muscle contraction,the binding of cross-bridges between actin and myosin filaments is regulated by calcium ions $(Ca^{++})$.When an action

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$Ca^{++}$

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(B) During muscle contraction,the binding of cross-bridges between actin and myosin filaments is regulated by calcium ions $(Ca^{++})$.When an action potential reaches the sarcolemma,it triggers the release of $Ca^{++}$ from the sarcoplasmic reticulum into the sarcoplasm.These $Ca^{++}$ ions bind to the troponin complex on the actin filaments,which causes a conformational change in the tropomyosin.This shift exposes the active binding sites on the actin filament,allowing the myosin heads (cross-bridges) to attach to actin and initiate the contraction cycle.

Which ions must be present for the binding of cross-bridges during muscle contraction?

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