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An exothermic reaction is a chemical or physical reaction that releases heat. It gives net energy to its surroundings. That is, the energy needed to initiate the reaction is less than the energy that is subsequently released. When the medium in which the reaction is taking place gains heat, the reaction is exothermic. When using a calorimeter, the total amount of heat that flows into (or through) the calorimeter is the negative of the net change in energy of the system.
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 ...