When calcium ions are released from the sarcoplasmic reticulum, they bind with _ during muscle contraction.
Correct answer: D. Troponin
- A. Tropomyosin
- B. Sarcolemma
- C. Cytosol's ions
- D. Troponin
Explanation
Calcium ions, which are released, bind to troponin, which in turn allows the tropomyosin to give way, thus allowing the muscle to stay contracted.
This question appeared on the UHS MDCAT 2012 paper, which you can sit online with every answer explained.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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