But then to regenerate the much needed NAD plus coenzymes, the Pyruvate is transformed into lactic acid. And under our conditions, under physiological conditions of the cells of our body, lactic acid associates into its conjugate based lactate and the h plus ions. And that's why our cells produce lactate. So our cells undergo lactic acid fermentation to basically regenerate the NAD plus molecules needed for glycolys to actually continue. So any type of cell that uses anaerobic respiration will generate these lactate molecules. And two examples that we're going to focus on, the two dominant types of cells that actually use anaerobic respiration are red blood cells and skeleton muscle cells.