During skeletal muscle contraction, calcium binds directly to which protein to initiate movement of the regulatory complex?
Correct answer: A. Troponin
- A. Troponin
- B. Actin
- C. Myosin
- D. Titin
Explanation
Calcium binds to troponin, causing tropomyosin to move away from actin's binding sites. Myosin then forms cross-bridges with actin, while titin helps maintain sarcomere structure.
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