Biology

The organisms that perform lactic acid fermentation are bacteria and muscle cells.

Many types of bacteria are capable of performing lactic acid fermentation. For example, Lactobacillus species are well-known bacteria that carry out lactic acid fermentation. They use this process to break down sugars (such as glucose) in the absence of oxygen and produce lactic acid. This is important in the production of fermented foods like yogurt and cheese.

During intense exercise, when the oxygen supply to muscle cells is limited, it switches to lactic acid fermentation to continue producing ATP without oxygen. ...