So here it becomes glucose plus two ADP plus two ortho phosphates produces two lactate, two ATP and two water molecules. And as I mentioned just a moment ago, during strain use exercise, our skeletal muscle cells may not receive an adequate supply of oxygen and these cells will begin to undergo lactic acid fermentation to generate those ATP molecules quickly and effectively. And in that case, there's a build up of lactate so lactic acid and that causes fatigue. Now, our own cells are not the only cells that utilize lactic acid lactic acid fermentation. Many bacterial cells that infect our body and many other organisms utilize lactic acid fermentation. For instance, three important bacterial cells that utilize lactic acid fermentation to basically generate ATP are the following.