What is the main role of tropomyosin in a relaxed skeleta...

What is the main role of tropomyosin in a relaxed skeletal muscle fiber?

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AIt breaks down ATP to provide energy.

It covers myosin-binding sites on actin, preventing cross-bridge formation.

CIt pumps Ca2+ back into the sarcoplasmic reticulum.

DIt releases acetylcholine at the neuromuscular junction.

EIt forms the thick filament backbone.

Explanation

In relaxation, tropomyosin blocks actin's binding sites. When Ca2+ binds troponin, tropomyosin moves and allows myosin to attach.

Source: entermedschool.org