In the initiation ofmuscle contraction, calcium ions bind totropomyosin, exposing active sites on actin for cross-bridge formation.

Question

Quizplus · Accepted Answer

In the initiation of muscle contraction, calcium ions bind to troponin, not tropomyosin. This causes a conformational change that moves tropomyosin away from actin's binding sites, allowing myosin to bind to actin and initiate contraction.

In the Initiation Ofmuscle Contraction, Calcium Ions Bind Totropomyosin, Exposing