The immediate reserve that regenerates ATP at the very start of vigorous muscle contraction is
- A. creatine phosphate
- B. glycogen only
- C. lactic acid
- D. haemoglobin
Explanation
Creatine phosphate donates its phosphate to ADP in a single step, replenishing ATP within seconds before glycogen breakdown catches up. Lactic acid is a product of anaerobic glycolysis, not a fuel reserve.
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