Discuss how the ATP-PCr system efficiently produces energy for explosive movements despite its limited capacity for sustained activity. (4 marks)
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Sample Answer
- The ATP-PCr system quickly rebuilds ATP in one step by transferring phosphate from phosphocreatine to ADP, making it the fastest energy production method.
- This system requires no oxygen or complex chemical processes, allowing immediate energy availability during explosive movements like jumping or sprinting.
- The system provides approximately 55% of energy during maximal activities lasting 1-10 seconds without producing fatiguing by-products.
- While highly efficient for immediate needs, capacity is limited by small phosphocreatine storage (120g) in muscle cells.
- Training enhances efficiency by increasing storage capacity and improving ATP regeneration rates.
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Sample Answer
- The ATP-PCr system quickly rebuilds ATP in one step by transferring phosphate from phosphocreatine to ADP, making it the fastest energy production method.
- This system requires no oxygen or complex chemical processes, allowing immediate energy availability during explosive movements like jumping or sprinting.
- The system provides approximately 55% of energy during maximal activities lasting 1-10 seconds without producing fatiguing by-products.
- While highly efficient for immediate needs, capacity is limited by small phosphocreatine storage (120g) in muscle cells.
- Training enhances efficiency by increasing storage capacity and improving ATP regeneration rates.