|Table of contents|
2 Breakdown of Pyruvate
3 See Also
4 External links
Glycolysis does not need oxygen in any of its steps. It is a metabolic pathway that is found in all living organisms and it probably evolved billions of years ago before the Earth's atmosphere contained oxygen.
Aerobic respiration requires oxygen. It is the preferred method of pyruvate breakdown. It yields 36 ATP molecules, as well as carbon dioxide, and water. This makes for a total gain of 38 ATP molecules during cellular respiration. This takes place in the mitochondria of the cells.
Anaerobic respiration doesn't require oxygen. In this process, the pyruvate is only partially broken down.
Both ethyl alcohol and lactic acid contain chemical energy that can't be used by anaerobic respiration, making this an inefficient process. Anaerobic respiration releases a total of two ATP molecules (compare to the 38 of aerobic respiration).