BI-1022
Oxygen debt
Biology · Secondary 3 · Hard · Oxygen debt
During vigorous exercise, a student’s leg muscles start to ache due to lactic acid build-up. After the exercise stops, why does the lactic acid level in the blood gradually decrease?
- It is transported to the liver and converted back to glucose using oxygen.
- It is broken down in muscles without using any oxygen.
- It is stored permanently in muscles as a source of energy.
- It is excreted unchanged from the body in sweat.
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