Why is respiration considered an exothermic reaction? Explain

Respiration is considered an exothermic reaction because it releases energy in the form of heat. Respiration is the process by which cells break down glucose (or other organic molecules) to release energy. During this process, chemical bonds in glucose are broken, and energy is released. 

This energy is used by the cell for various functions, including growth, repair, and reproduction. Because the process releases more energy than it absorbs, respiration is classified as an exothermic reaction. In addition to energy, respiration also produces by-products like carbon dioxide and water.