Sarcoplasmic reticulum of muscle fibers is mainly responsible for:
Correct answer: A. Calcium storage
- A. Calcium storage
- B. Protein synthesis
- C. Lipid metabolism
- D. Strong cell wastes
Explanation
The sarcoplasmic reticulum of muscle fibers is mainly responsible for "Calcium storage." It plays a crucial role in regulating calcium ion levels within muscle cells, which is essential for muscle contraction and relaxation. When a muscle is stimulated, calcium ions are released from the sarcoplasmic reticulum, allowing the muscle to contract.
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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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