BI-1036
Oxygen debt
Biology · Secondary 3 · Hard · Oxygen debt
An athlete runs a 400 m race and then rests on a bench. Which statement best explains why her blood lactic acid concentration falls during the first few minutes of rest?
- Lactic acid is transported to the liver and oxidised, helping to convert it back to glucose
- Lactic acid is directly exhaled from the lungs as lactic acid gas
- Lactic acid is converted into oxygen in the muscles
- Lactic acid remains in the blood but stops being produced
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