During lactic acid fermentation, NADH undergoes what transformation?

During lactic acid fermentation, NADH plays a crucial role in the regeneration of NAD+. In this process, NADH is oxidized, meaning it loses electrons and hydrogen atoms, and is converted back into NAD+. This transformation is essential for allowing glycolysis to continue when oxygen is scarce, as it helps to maintain the flow of electrons and the regeneration of cellular energy.

In lactic acid fermentation, pyruvate, the end product of glycolysis, is converted into lactic acid. For this reaction to continue, NAD+ must be available to accept electrons during glycolysis. The conversion of NADH to NAD+ ensures that glycolysis can keep producing ATP in the absence of oxygen. Thus, the correct description of what happens to NADH during lactic acid fermentation is that it is oxidized and converted to NAD+.