Question

Why is respiration considered as an exothermic reaction? Explain.

Answer 1

One of the byproducts of the respiration process is energy. We know that respiration is the process by which the food is broken down by the action of oxygen, thereby producing carbon dioxide and water along with the release of energy.

Complete step by step answer:
Respiration is basically the release of energy from the food that we intake. The energy so released is useful for all the metabolic activities which are essential for the human body in order to function efficiently. The reaction taking place is represented as follows-
${C_6}{H_{12}}{O_6} + {O_2} \to C{O_2} + {H_2}O + Energy$
Here, as you can see glucose, which is a form of carbohydrate, is oxidized to form carbon dioxide, water along with the release of energy. Now, as we know exothermic reactions are reactions which are associated with release of energy. Hence, Respiration is also considered as an exothermic reaction as it associated with the release of energy. The energy that is released usually in the form of heat. On the other hand, in an endothermic reaction, the energy is generally absorbed as heat.
Since Respiration involves an overall release of energy, it is considered as an exothermic process.

Additional information: On the basis of whether heat energy is released or absorbed, the reaction can be of two types- Exothermic and endothermic reactions.
Exothermic reactions involve the release of energy whereas, endothermic reactions involve absorption of energy.

Note:
Please don’t confuse respiration with the breathing process. Both respiration and breathing processes are different from one another. Breathing process is a physical process which involves inhalation of oxygen and exhalation of carbon dioxide. Respiration is a chemical process involving breaking down of food particles to release energy.