What is anaerobic respiration and how does it work?

Anaerobic respiration is the respiration in cytoplasm which takes place without external oxygen.

Anaerobic respiration is the first respiration in living world without external oxygen. It takes place in cytoplasm with the help of glycolytic enzymes. The conversion of glucose to pyruvic acid / or alcohol/ or lactic acid is anaerobic. When atmosphere was without free oxygen this was the only method of releasing energy from glucose. In the cytoplasm of almost all cells glycolysis takes place. tales place in mitochondria.