Thick filaments in skeletal muscle are composed of
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★ Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a musclecontracts or relaxes. Two of the important proteins are myosin, which forms the thick filament, and actin, which forms the thin filament. Myosin has a long, fibrous tail and a globular head, which binds to actin.
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