In which of the following components of the body does lactic acid fermentation take place?

Explanation

Lactic acid fermentation primarily occurs in skeletal muscles under anaerobic conditions, such as during intense exercise when oxygen supply is limited. Pyruvate, a product of glycolysis, is converted to lactic acid, leading to its accumulation and subsequent muscle fatigue. The brain, heart, and liver do not typically undergo lactic acid fermentation. The brain relies heavily on aerobic respiration for energy due to its high oxygen requirement. The heart muscles are designed to resist fatigue and maintain continuous aerobic respiration. The liver's role is to convert lactic acid back to glucose, not to accumulate it.