The Ca++ ions released during a muscle fiber contraction attach with:
Correct answer: C. Troponin
- A. Myosin
- B. Actin
- C. Troponin
- D. Tropomyosin
Explanation
Ca2+ ions attach to troponin during muscle fiber contraction. Troponin is a regulatory protein complex found on the actin filaments in muscle fibers. When Ca2+ ions bind to troponin, it induces a conformational change that moves tropomyosin away from the binding sites on actin, allowing myosin to bind 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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