Calcium must be present for muscle contraction to occur. Calcium

Question

Quizplus · Accepted Answer

Calcium ions bind to troponin, which is part of the thin filament in muscle fibers. This binding causes a conformational change in troponin that leads to the movement of tropomyosin, another component of the thin filament, away from the binding sites on actin molecules. This exposure of the actin binding sites allows myosin heads to attach to actin, initiating muscle contraction.

Calcium Must Be Present for Muscle Contraction to Occur