The one that stores calcium is __________?
Correct answer: C. Sarcoplasmic reticulum
- A. Sarcolemma
- B. Sarcoplasm
- C. Sarcoplasmic reticulum
- D. Cytosol
Explanation
The sarcoplasmic reticulum is a specialised smooth endoplasmic reticulum that stores calcium ions and releases them to start muscle contraction. The likely mistake is sarcoplasm, which is the muscle-cell cytoplasm but is not the specialised calcium-storage network.
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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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