What is the role of Ca2+ in the regulation of skeletal muscle contraction? A. binds to troponin which exposes the myosin binding sites on actìn B. binds to tropomyosin uncovering the myosin binding sites on actin C. binds to actin and allows myosin binding sites on actin to be exposed D. binds to myosin which allows myosin to bind to actin E. binds to calmodulin which exposes the myosin binding site on actin
