Calcium responsible for regulating contraction response is present in_________.
Correct answer: C. cytoplasm
- A. protoplasm
- B. pancreas
- C. cytoplasm
- D. intestine
Explanation
Calcium ions in the muscle-cell cytoplasm, specifically the sarcoplasm, help trigger actin-myosin interaction and muscle contraction. The pancreas and intestine are organs, not the site described here.
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