Unlike aerobic respiration, anaerobic respiration does not need oxygen. It is the release of a relatively small amount of energy in cells by the breakdown of food substances in the absence of oxygen.

Anaerobic respiration happens in muscles during hard exercise: ( yup when you’re flexing hard ) ;)

glucose → lactic acid

C₆H₁₂O₆ → 2C₃H₆O₃

*There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidized to carbon dioxide and water later.*

This causes an oxygen debt - known as excess post-exercise oxygen consumption (EPOC) - that needs to be ‘repaid’ after the exercise stops. This is why we keep on breathing deeply for a few minutes after we have finished exercising to settle down the ‘energy-loss’ AKA ‘debt’.

glucose → ethanol + carbon dioxide

C₆H₁₂O₆ → 2C₂H₅OH + 2C0₂

Ethanol is the alcohol found in alcoholic drinks like beer and wine. In bread-making, bubbles of carbon dioxide gas expand the dough and help the bread rise. 

*Anaerobic respiration by yeast helps bread dough rise*

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