Q4. When and where does anaerobic respiration occur in humans?
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Anaerobic respiration happens in muscles during hard exercise. Glucose is not completely broken down, so less energy is released than during aerobic respiration. There is a build-up of lactic acid in the muscles during vigorous exercise. The lactic acid needs to be oxidised to carbon dioxide and water later.
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It is happening in places where mitochondria are not present. In humans, red blood corpuscles do not have mitochondria, that's why anaerobic respiration always happens in RBCs. But in muscle cells, when there is a lack of oxygen, it happens as a result of the fact that lactic acid is produced.
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