Answer :
The reactant of lactic acid fermentation is glucose, which is broken down into pyruvate molecules. During intense exercise, the buildup of lactic acid is a result of the accumulation of pyruvate molecules.
Which are generated by the fermentation of glucose. The pyruvate molecules, in turn, are converted into lactic acid by the enzyme lactate dehydrogenase. The lactic acid produced by this process is then broken down into lactate and hydrogen ions, which are then used to generate energy, in the form of ATP molecules, through a process called oxidative phosphorylation. The buildup of lactic acid, therefore, is a sign that the body is producing energy anaerobically, which is not as efficient as the production of energy through aerobic respiration.
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