Explain how the circulatory and respiratory systems support a 400 m sprint. (4 marks)
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Sample Answer
Start Phase:
- Respiratory rate rapidly increases while heart pumps more blood to working muscles
- Pulmonary circulation enhances oxygen uptake as blood flow redirects to active muscles
Mid Race:
- Respiratory system maximises oxygen delivery while circulation maintains high blood flow
- Both systems work at peak capacity to meet oxygen and energy demands
Final Phase:
- Respiratory effort maintains while circulatory system manages oxygen debt
- Both systems maximise efficiency to support sprint completion
Show Worked Solution
Sample Answer
Start Phase:
- Respiratory rate rapidly increases while heart pumps more blood to working muscles
- Pulmonary circulation enhances oxygen uptake as blood flow redirects to active muscles
Mid Race:
- Respiratory system maximises oxygen delivery while circulation maintains high blood flow
- Both systems work at peak capacity to meet oxygen and energy demands
Final Phase:
- Respiratory effort maintains while circulatory system manages oxygen debt
- Both systems maximise efficiency to support sprint completion