Multiple choice

Which of the following structures of muscle contraction is integral in skeletal muscle and cardiac muscle, but not smooth muscles of the body?

  1. Troponin

  2. Tropomyosin

  3. Myosin

  4. Actin

  5. Myofibril

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A Correct answer
Explanation

Troponin is a complex of three regulatory proteins; troponin C, troponin I and troponin T,  and is integral to muscle contraction in skeletal muscles and cardiac muscles, but not in smooth muscles.