Concept 5 Review: Lactic Acid Fermentation
In lactic acid fermentation, the pyruvic acid from glycolysis is reduced to lactic acid by NADH, which is oxidized to NAD+. This commonly occurs in muscle cells. Lactic acid fermentation allows glycolysis to continue by ensuring that NADH is returned to its oxidized state (NAD+).

Fermentation Pathways
Alcoholic Fermentation
Fermentation Pathways