Cellular fermentation

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In animal cells, the process of using oxygen (O2) and glucose (C6H12O6) is known as cellular respiration. When oxygen is lacking, cells undergo cellular fermentation. In humans lactic acid is a product. During heavy exercise, oxygen cannot be taken in quickly enough, so muscle cells resort to cellular fermentation. This results the production of lactic acid and a burning sensation in the muscles. You can also see Wikipedia's fermentaion article for some more about cellular fermentation-[1] Lactic acid is found in dairy products such as yoghurt.