BIOL - Anaerobic Respiration
Biology, IB | IGCSE | GCE | AP Biology
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’.
Anaerobic respiration in plants and yeast
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*
Fun fact: Aerobic respiration releases 19 times more energy than anaerobic respiration from the same amount of glucose.
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