Which protein is responsible for blocking the binding sites on actin when a muscle is at rest?
A) Dystrophin.
B) Myosin.
C) Tropomyosin.
D) Troponin C.

The protein responsible for blocking the binding sites on actin during muscle rest is tropomyosin. It prevents myosin from attaching to actin until a muscle contraction is initiated. This regulation is crucial for muscle function. ;

Answered by GinnyAnswer | 2025-07-05

The protein that blocks the binding sites on actin in resting muscles is tropomyosin. It regulates the interaction between actin and myosin during muscle contraction. When a muscle is stimulated, calcium ions trigger a change that moves tropomyosin, allowing contractions to occur.
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Answered by Anonymous | 2025-07-21