Question

In a relaxed muscle fibre, the myosin binding site on action is blocked by​

Answer 1

Explanation:

Tropomyosin

Tropomyosin is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin.

Answer 2

Answer:

Calcium is required by two proteins, troponin and tropomyosin, that regulate muscle contraction by blocking the binding of myosin to filamentous actin. In a resting sarcomere, tropomyosin blocks the binding of myosin to actin.

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