NEET Zoology Muscle Contraction MCQ Question
Which of the following statements about muscle contraction is correct?
Calcium ions bind to troponin, exposing active sites on actin.
Myosin filaments are thinner than actin filaments.
The A band is bisected by the Z line.
Sarcoplasmic reticulum stores sodium ions for muscle contraction.
Correct Answer
Detailed Explanation
Calcium ions play a crucial role in muscle contraction by binding to troponin, which then removes the masking of active sites on actin, allowing myosin to interact with actin filaments. The other options contain inaccuracies regarding the relative sizes of filaments, the structure of the A band, and the role of sodium ions.
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