alleryWhich substance accumulates in muscle cells when they perform anaerobic respiration during exercise, making us feel tired?
ACitric acid
BLactic acid
CAcetyl-CoA
DPyruvic acid
Answer & Solution
Correct answer: B. Lactic acid
1. During heavy exercise muscle cells perform anaerobic respiration.
2. Less energy is produced and lactic acid accumulates.
3. Pyruvic acid is the input that gets converted, not the accumulated product, so it is ruled out.
4. This build-up of lactic acid is why we feel tired.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 2 "Life Processes in Living Organisms Part 1", p.24_
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