Calcium is important in skeletal muscle contraction because it

Options

A. Prevents the formation of bonds between the myosin cross bridges and the actin filamen
B. Detaches the myosin head from the actin filament
C. Activates the myosin ATPase by binding to it
D. Binds to troponin to remove the masking of active sites on actin for myosin

Answer

D

Explanation

During muscle contraction, sarcoplasmic reticulum releases calcium ions which bind to troponin thus causing tropomyosin to shift from the phase of actin filament to which myosin head need to bind to produce contraction