Calcium is important in skeletal muscle contraction because it

Binds to troponin to remove the masking of active sites on actin for myosin.

Activates the myosin ATPase by binding to it.

Prevents the formation of bonds between the myosin cross bridges and the actin filament.

Detaches the myosin head from the actin filament.

Solution

Binds to troponin to remove the masking of active sites on actin for myosin.

The signal for contraction increase Ca⁺⁺ level many folds in the sarcoplasm.

Ca⁺⁺ now binds with sub-unit of troponin (troponin 'C') which is masking the active site on actin filament and displaces the sub-unit of troponin.

Once the active site is exposed, head of the myosin attaches and initiate contraction by sliding the actin over myosin.

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