Why we need to have anaerobiv respiration as lactic acid produced as a waste product; not nearly as much energy is released as with aerobic respiration. However it is necessary if, for example, you are running. In this case, it won't be long before the body's demand for oxygen overtakes supply. This is where anaerobic respiration replaces aerobic respiration.
Once you have finished exercising, your heart and breathing rates continue to rise, in order for you to repay your oxygen debt.
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