NEET Zoology Muscle Contraction MCQ Question
Which of the following statements about muscle contraction are correct?
Actin filaments are thinner than myosin filaments.
Myosin filaments are made of globular actins.
Tropomyosin is present in thick filaments only.
Troponin binds to actin in the resting state.
Correct Answer
Detailed Explanation
Actin filaments are indeed thinner compared to myosin filaments, which are thicker. Myosin is composed of meromyosins, not globular actins, and tropomyosin runs along thin filaments, not thick. Troponin masks the binding sites on actin in the resting state, but it does not bind to actin.
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