ATP is required during muscle contraction for
- A. storing glycogen in the muscle
- B. detaching myosin heads from actin and pumping calcium back after contraction
- C. synthesising haemoglobin
- D. nothing once contraction has begun
Explanation
Each myosin head needs a fresh ATP to release actin and re-cock, and the calcium pump needs ATP to restore relaxation. Without ATP the heads stay locked, which is exactly what causes rigor mortis.
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