Fermentation

Two pathways of anaerobic respiration in cells are fermentation pathways, one producing ethanol and the other producing lactate. Both fermentation processes replenish the necessary NAD⁺ for glycolysis to proceed with its net yield of 2 ATP molecules per glucose. The lactate produced is cycled out of the cell and transported in the blood. A portion of it goes to the liver where it is converted back to glucose in the Cori cycle and provided back to the cells.