Calcium ions triggers muscle contraction by binding to ___________________?
Correct answer: C. Troponin
- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
Explanation
Calcium binds to troponin C, causing the troponin-tropomyosin complex to move away from actin’s myosin-binding sites. This permits cross-bridge formation and contraction.
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