In the resting muscle fibre, tropomysin partially covers

Options

A. Ca binding sites on troponin
B. Actin binding sites on myosin
C. Myosin binding sites on actin
D. Ca binding sites on actin

Answer

C

Explanation

Tropomyosin is a regulatory component of thin filament. When skeletal muscles fiber is relaxed, tropomyosin covers myosin – binding sites on actin molecules thereby preventing myosin from binding to actin.