What is the Function of Troponin in Muscle Contraction

Question

What is the function of troponin in muscle contraction?
A)Troponin slides past myosin, causing muscle shortening.
B)Troponin forms the cross-bridges between actin and myosin.
C)Troponin moves tropomyosin from actin binding sites, allowing myosin to bind to actin.
D)Troponin has no function in muscle contraction.

Accepted Answer

Troponin moves tropomyosin from actin binding sites, allowing myosin to bind to actin. Troponin is a protein that regulates muscle contraction by binding to calcium ions. When calcium ions bind to troponin, it causes a structural change that moves tropomyosin away from the binding sites on actin, allowing myosin to bind to actin and initiate muscle contraction.