Anaerobic respiration occurs when there is not enough oxygen. In humans a
common situation is during exercise when the oxygen supply is less than the
demand from the cells. Therefore the cells have to use anaerobic respiration
to get the energy. However you do not get the same products. Anaerobic
respiration produces a substance called lactic acid.
Anaerobic respiration can also be used to make alcohol. This reaction
occurs in microorganisms such as bacteria and yeast, which use glucose to
form carbon dioxide and ethanol. This process is known as fermentation.
The process of anaerobic respiration can lead to oxygen debt. Oxygen debt
is when the amount of oxygen entering the body is less than required by the
muscles. Therefore your heart, lungs, and blood cannot keep up with the
Therefore after you stop doing the exercise you will keep breathing heavily
to ensure that enough oxygen enters the system to enter the muscles and
to ensure all the harmful lactate and carbon dioxide.