Editor
When we work hard we suffer from muscle fatigue because muscle cells
Difficulty: Medium
A: 

Carry out aerobic respiration at a faster rate and so are tired  

B: 

Carry out anaerobic respiration and so accumulate more $CO_{2}$

C: 

Carry out anaerobic respiration and so accumulate lactic acid 

D: 

Carry out aerobic respiration at faster rate and so burst 

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