alleryAnaerobic respiration in human muscles produces:
AEthanol + CO₂
BPyruvate + H₂O
CGlucose + O₂
DLactic acid
Answer & Solution
Correct answer: D. Lactic acid
1. During strenuous exercise, muscle cells run out of O₂.
2. Glucose is broken down to LACTIC ACID (not ethanol — that's yeast).
3. The accumulating lactic acid causes muscle cramps and soreness.
4. Recovery (oxygen debt) converts lactic acid back to pyruvate.
_Source: syllabus Science Ch 5 §5.2 Anaerobic Respiration_
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