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B
Actin
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C
Tropomysin
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D
Troponin
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Solution
The correct option is D Troponin Troponin is a globular protein complex. This is the protein which is involved in muscle contraction. It is the calcium receptive protein of the muscle. It occurs with tropomyosin in the thin filaments of muscle tissue. The binding and the release of the calcium ions causes conformational change in the structure of troponin. This results in the contraction and relaxation of the muscles.