Anaerobic respiration is without oxygen. It does not break down the glucose completely, so much less energy is released than in aerobic respiration. Lactic acid is produced, which is poisonous and causes cramp.
The equation for anaerobic respiration is:
glucose → lactic acid (+ a little energy)
After exercise you continue to pant in order to supply more oxygen to oxidise the lactic acid. The amount of oxygen required is called the oxygen debt.
lactic acid + oxygen → carbon dioxide + water
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