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Contractile protein - class-XII
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The important muscle proteins that helps in the movement are
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A
All of the above
💡 Explanation:
- Skeletal muscle fiber is made up of two types of filaments. They are thick filament (myosin) and thin filament (actin). Contraction of a muscle fiber takes place by the sliding of the thin filaments over the thick filaments.
- Myosin (thick) filament is also a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament.
- Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length. A complex protein troponin is distributed at regular intervals on the tropomyosin.
- Hence, the important muscles proteins that help in the movement are actin and myosin, troponin and tropomyosin.
- So, the correct answer is 'All of the above'.