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Calcium is important in skeletal muscle contraction because it
Explanation
$Ca^{2+}$ binds troponin C, unmasking actin's myosin-binding sites.
Detailed Solution
The signal for contraction increases the $Ca^{2+}$ level many-fold in the sarcoplasm.
$Ca^{2+}$ binds with the subunit of troponin (troponin C) which is masking the active site on the actin filament, and displaces it.
Once the active site is exposed, the head of myosin attaches and initiates contraction by sliding the actin over myosin.