Outline how the ATP-PCr system provides energy for immediate muscle contraction. (3 marks)
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Sample Answer
- When an impulse from the nervous system triggers muscle contraction, ATP rapidly splits into ADP and Pi releasing immediate energy.
- During high-intensity activity, creatine phosphate breaks down to release a phosphate molecule which combines with ADP to replenish ATP stores.
- This energy system can sustain maximal performance for approximately 10-15 seconds before creatine phosphate stores are depleted requiring 3-5 minutes for full recovery.
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Sample Answer
- When an impulse from the nervous system triggers muscle contraction, ATP rapidly splits into ADP and Pi releasing immediate energy.
- During high-intensity activity, creatine phosphate breaks down to release a phosphate molecule which combines with ADP to replenish ATP stores.
- This energy system can sustain maximal performance for approximately 10-15 seconds before creatine phosphate stores are depleted requiring 3-5 minutes for full recovery.