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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: syllabus Biology, Chapter 20, Locomotion and Movement._

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