Exercise & Oxygen Debt — GCSE Biology Revision
Revise Exercise & Oxygen Debt for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to PhotosynthesisWhat is Exercise & Oxygen Debt?
During intense exercise, the body may not be able to supply enough oxygen to the muscles for aerobic respiration. Muscles then respire anaerobically, producing lactic acid. After exercise, the body needs to take in extra oxygen to break down this lactic acid and repay the 'oxygen debt'. This is why you continue to breathe heavily after you stop exercising.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The physiological responses to exercise (increased heart rate, breathing rate) and the concept of oxygen debt are key.
Step-by-step explanationWorked example
A sprinter runs a 200m race. Their heart rate and breathing rate increase to supply more oxygenated blood to the muscles. However, this is not enough, so their muscles respire anaerobically, building up an oxygen debt. After the race, they will pant to take in extra oxygen to break down the accumulated lactic acid.
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Common mistakes
- 1Thinking oxygen debt is about 'catching your breath'. It's a chemical process: the extra oxygen is needed to oxidise the lactic acid that has built up in the muscles and liver back into glucose.
- 2Confusing muscle fatigue with being out of breath. Muscle fatigue is caused by the build-up of lactic acid, which lowers the pH and inhibits enzyme function in the muscle cells.
- 3Forgetting the long-term effects of exercise. Regular exercise increases heart and lung volume, leading to a more efficient supply of oxygen to the muscles and a lower resting heart rate.
Exercise & Oxygen Debt exam questions
Exam-style questions for Exercise & Oxygen Debt with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Exercise & Oxygen Debt
Core concept
During intense exercise, the body may not be able to supply enough oxygen to the muscles for aerobic respiration. Muscles then respire anaerobically, producing lactic acid. After exercise, the body ne…
Frequently asked questions
What is lactic acid?
Lactic acid is a waste product of anaerobic respiration in animal cells. Its build-up in muscles leads to pain and fatigue.
How does the body recover from oxygen debt?
The body recovers by maintaining a high breathing rate and heart rate after exercise. The excess oxygen taken in is transported to the liver, where it is used to convert the lactic acid back into glucose.