In the myofibrils of muscle fibre:

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(D) Myofibrils are the contractile elements of muscle fibres. They are composed of repeating units called sarcomeres,which contain thick filaments mad

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All of the above

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(D) Myofibrils are the contractile elements of muscle fibres. They are composed of repeating units called sarcomeres,which contain thick filaments made of the protein myosin and thin filaments made of the protein actin. Additionally,$ATP$ is essential for the contraction and relaxation cycles of these filaments. Therefore,all the mentioned components are present in the myofibrils.

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