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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.
The fact is that you could not live except for a huge number of both exothermic and endothermic reactions. Thinking and reading this both involve reactions such as ATP hydrolysis and alkene isomerization. Glycolysis, the TCA cycle, electron transport and phosphorylation capture energy through a succession of endothermic and exothermic reactions. Energy is saved for future use by turning it into fat which is ultimately an endothermic process coupled to other exothermic processes. Even emotions must ultimately be chemical process even though they probably involve electrical processes as well. However, the electrical processes are made possible by chemical reactions. As you study any aspect of biology, keep in mind that it all depends on chemical reactions and essentially all chemical reactions are either exothermic or ...