The function of calcium ions in muscle contraction is to:
Correct answer: A. Bind to troponin molecule and cause them to move
- A. Bind to troponin molecule and cause them to move
- B. Polarize visible light
- C. Aid in the transmission of nerve impulse
- D. Bind to tropomyosin molecule and cause them to form cross bridges
Explanation
Calcium ions play a critical role in muscle contraction by binding to the troponin molecules present on the thin filaments. When calcium ions bind to troponin, it induces a conformational change in the troponin-tropomyosin complex. This change exposes the myosin-binding sites on the actin filaments, allowing the myosin heads to form cross-bridges and initiate muscle contraction.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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