Respiration

Respiration
Respiration is a physical process in which living organisms take in oxygen from the surrounding medium and emit carbon dioxide. the term respiration is also used to refer to the liberation of energy, within a cell. from fuel molecules such as carbohydrates and fats. Carbon dioxide and water are the products of this process, which is sometimes called cellular respiration to distinguish it from the physical process of breathing.
Small organisms of the kingdoms Protista and Prokaryotae have no specialized respiratory mechanisms; instead, they rely on the diffusion of oxygen an…