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Question
The accumulation of lactic acid in muscle cells causes ______.
Options:
A .  cramps 
B .  heart blockage  
C .  boils 
D .  stroke 
Answer: Option A
:
A
Lactic acid is a byproduct of anaerobic respiration of glucose. During heavy exercises or prolonged physical activity, there is a deficit of oxygen required to enableall the muscle cells to generate energy aerobically. Muscle cells then respireanaerobically andproduces lactic acid. Accumulation of lactic acid in the muscles causes cramps.

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