Question
Why do we respire?
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Answer
We respire to use the oxygen, to oxidise our food and release energy. This is similar like burning but a slower process. it also needs respiratory enzymes .Respiration is a slower process than burning and energy released can be stored for later use. $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{O}_2 \rightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2+$ energy.
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