GCEBiologyRespiration2021

During vigorous exercise, a student's muscles begin to ache. This is most likely because

Aoxygen supply exceeds demand, causing excess ATP production
Blactic acid accumulates in the muscles due to anaerobic respirationCORRECT
Cethanol produced in the muscles irritates the muscle fibres
Dcarbon dioxide is converted to carbonic acid in the muscle tissue
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Why the answer is B, and why the others tempt you.
During vigorous exercise, the oxygen supply to muscles becomes insufficient to meet the energy demand. The muscles resort to anaerobic respiration, producing lactic acid as a byproduct. The accumulation of lactic acid lowers the pH in muscle tissue, causing the characteristic aching or burning sensation. Ethanol is not a product of anaerobic respiration in mammals.
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