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| Types of Respiration |
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| Cellular respiration is of 2 types according to its dependence on oxygen. |
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| a) Aerobic respiration |
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| b) Anaerobic respiration. |
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| Organic food is completely oxidised with the help of oxygen into carbon dioxide and water. This occurs in the mitochondria. 2830 KJ or 686 K cal of energy is liberated during the oxidation of one molecule of glucose. |
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| When food is oxidised without using molecular oxygen it is called anaerobic respiration. Anaerobic respiration is exceptional in some cases as in the tape worms living inside the human intestine. But temporary anaerobic respiration may occur even in our body in the fast working skeletal muscles, as in running, swimming etc. The fatigue experience is due to lactic acid accumulated in the muscles, due to the shortage of oxygen, a condition called as oxygen debt. When one rests after the exercise the lactic acid gets slowly oxidized by the oxygen available later and then the debt is cleared. |
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| Anaerobic respiration is also called fermentation. It is found in lower organisms like yeast and bacteria and may involve any one of the following reactions. |
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