Question : Which one of the following chemicals is associated with muscle fatigue ?
Option 1: Uric acid
Option 2: Acetic acid
Option 3: Pyruvic acid
Option 4: Lactic acid
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Correct Answer: Lactic acid
Solution : The correct option is Lactic acid.
Lactic acid (lactate) is one of the primary compounds responsible for muscular fatigue. During vigorous or sustained muscular exercise, oxygen delivery may fall short of meeting energy needs, resulting in anaerobic metabolism. This causes lactic acid to build up in the muscles, contributing to tiredness, muscular discomfort, and a decline in muscle function.
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