Question

Why respiration is considered as an exothermic reaction?

Answer 1

As you know Exothermic reaction release heat and energy .

when you breathe out , you noticed that your breathe is warmer.

it means heat has been released from your body .

so... respiration is an exothermic reaction...

Answer 2

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Respiration is considered as an exothermic reaction because in respiration oxidation of glucose takes place which produces large amount of heat energy.

C6H12O6 (aq) + 6O2 (g) → 6CO2 (g) + 6H2O (l) + Energy