During the process of muscle contraction, Ca 2+ binds tropomyosin.

During muscle contraction, calcium ions (Ca2+) bind to troponin, not tropomyosin. This causes a conformational change that moves tropomyosin away from the myosin-binding sites on actin filaments, allowing myosin to bind to actin and initiate contraction.

During the process of muscle contraction, Ca 2+ binds tropomyosin.

During muscle contraction, calcium ions (Ca2+) bind to troponin, not tropomyosin. This causes a conformational change that moves tropomyosin away from the myosin-binding sites on actin filaments, allowing myosin to bind to actin and initiate contraction.