Myofibrils are made up of:

Myosin and actin

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Myosin and troponin

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Actin and tropomyosin

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All the above components

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Solution

The correct option is D All the above components
Myofibrils are made up of thick and thin filaments, which gives the muscles, striated appearance. A thin filament of myofibril contains 2 ‘F’ actins and two other proteins, namely troponin and tropomyosin. Thick filament composed of myosin molecule. Therefore, myofibrils are composed of actin, myosin, tropomyosin and troponin.

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