There are two ways of anaerobic breakdown of glucose. First (in both ways) step is breakdown of glucose molecule into pyruvate which takes place in cytoplasm.
█ The anaerobic breakdown in bacteria is called fermentation. During fermentation pyruvate is broken down to ethyl alcohol and carbon dioxide.
█ When there is lack of oxygen in our muscle cells, pyruvate is broken down to lactic acid.
Note: Very less amount of energy is released in both the above cases.
