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Respiration is a pure exothermic reaction because when we exhale there us carbon dioxide along with the residual oxygen and with certain amount of water vapour. No heat energy is provided during inhalation however the energy or heat liberated during oxidation of the food and other activities comes out as heat energy. Since there is heat energy released during respiration the reaction is called to be the exothermic reaction.
Distinguish between endothermic and exothermic reactions. 1  All chemical reactions involve the transfer of energy. 2  Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy.  Exothermic processes release energy upon completion, and are signified by a negative change in enthalpy.