Calcium ions bind with the troponin molecule and cause them to:
Correct answer: B. Move slightly
- A. Extend
- B. Move slightly
- C. Contract
- D. Remain in the same position
Explanation
When the muscle is required to contract, calcium ions bind with troponin molecule and cause them to move slightly.This has the effect of displacing the tropomycin and exposing the binding sites for the myosin head.
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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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