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After a hard run your muscles ache because they built up:
ALactic acid
BUric acid
CCitric acid
DAmino acid
Answer & Solution
Correct answer: A. Lactic acid
1. Repeated activation runs short of oxygen.
2. Glycogen breaks down anaerobically.
3. Lactic acid collects and causes fatigue.
_Source: NCERT Class 11 Biology, Chapter 20, Locomotion and Movement._
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