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Calcium is important in skeletal muscle contraction because it
Option 1 : Activates the myosin ATPase by binding to it.
Option 2 : Detaches the myosin head from the actin filament.
Option 3 : Prevents the formation of bonds between the myosin cross bridges and the actin filament.
Option 4 : Binds to troponin to remove the masking of active sites on actin for myosin.