When a muscle fibre is stimulated, the calcium ions needed for contraction are released from the
- A. mitochondria
- B. Golgi apparatus
- C. nucleus
- D. sarcoplasmic reticulum
Explanation
The sarcoplasmic reticulum stores calcium and floods the fibre with it when an impulse arrives along the T tubules. Mitochondria supply the ATP for contraction but not the calcium that triggers it.
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