The special contractile protein actin is foun | vedclass

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(B) In the structure of skeletal muscle,the myofibrils contain two types of filaments: thick filaments and thin filaments.Thick filaments are primaril

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Thin filaments of $I$-bands

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(B) In the structure of skeletal muscle,the myofibrils contain two types of filaments: thick filaments and thin filaments.Thick filaments are primarily composed of the protein myosin.Thin filaments are primarily composed of the protein actin,along with regulatory proteins like troponin and tropomyosin.The $I$-bands (isotropic bands) contain only thin filaments,while the $A$-bands (anisotropic bands) contain both thick and thin filaments.Therefore,the contractile protein actin is specifically a major component of the thin filaments found in the $I$-bands.

The special contractile protein actin is found in

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