Explain how the three energy systems provide ATP during a 1500 m race. (6 marks)
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Sample Answer
- The ATP-PCr system provides immediate ATP for the race start and tactical surges through rapid breakdown of stored creatine phosphate in muscle cells.
- The glycolytic system becomes dominant by producing ATP rapidly from glucose breakdown, though accumulating lactic acid affects performance.
- The aerobic system becomes the main ATP provider by completely breaking down glucose with oxygen in the mitochondria to power the middle section.
- Accumulated lactic acid from the glycolytic system reduces running efficiency while the aerobic system maintains steady ATP production.
- The three energy systems work together with varying contributions depending on race intensity and tactical requirements.
- ATP for the final sprint comes from remaining ATP-PCr stores and glycolytic system despite accumulated fatigue.
Show Worked Solution
Sample Answer
- The ATP-PCr system provides immediate ATP for the race start and tactical surges through rapid breakdown of stored creatine phosphate in muscle cells.
- The glycolytic system becomes dominant by producing ATP rapidly from glucose breakdown, though accumulating lactic acid affects performance.
- The aerobic system becomes the main ATP provider by completely breaking down glucose with oxygen in the mitochondria to power the middle section.
- Accumulated lactic acid from the glycolytic system reduces running efficiency while the aerobic system maintains steady ATP production.
- The three energy systems work together with varying contributions depending on race intensity and tactical requirements.
- ATP for the final sprint comes from remaining ATP-PCr stores and glycolytic system despite accumulated fatigue.