Calcium is important in skeletal muscle contraction because it

Options

A. detaches the myosin head from the actin filament
B. activates the myosin ATPase by binding to it
C. binds to troponin to remove the masking of active sites on actin for mysoin
D. Prevents the formation of bonds between the mysoin cross bridges and the actin filament

Answer

C

Explanation

Calcium plays a key regulatory role in muscle contraction . `Ca^(2+)` ions bind to troponin and changes its shape and position . This in turn , alter the shape and position of tropomyosin and hence , the active sites on F-actin are exposed . Due to this myosin cross-bridges are able to bind to these active sites and muscle contraction occurs.