How does the reduction of pyruvate to lactic acid during fermentation allow glycolysis to continue in the absence of oxygen?

Question

Quizplus · Accepted Answer

The reduction of pyruvate to lactic acid during fermentation is coupled to the oxidation of NADH to NAD+, allowing glycolysis to continue producing ATP in the absence of oxygen. Without this coupling reaction, NAD+ would become depleted and glycolysis could not proceed.

How Does the Reduction of Pyruvate to Lactic Acid During