Which of the following step occurs immediately after binding of Ca2+ with a troponin molecule during muscle contraction?
Correct answer: D. Tropomyosin gets removed from the binding sites of actin filaments
- A. Binding sites of actin get attached to the myosin head
- B. Troponin uncovers the actin binding sites
- C. Ca2+ goes back inside sarcoplasmic reticulum
- D. Tropomyosin gets removed from the binding sites of actin filaments
Explanation
Soon after the binding of Calcium ions, "tropomyosin gets removed from the binding sites of actin filaments". It provides space for myosin filament to attach with actin filament for 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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