Breathing is a process of gas exchange whereby living things obtain oxygen and eliminate carbon dioxide into the atmosphere. Oxygen obtained through respiration is used by cells in the cellular respiration process to obtain energy.
Each animal has a different way of performing gas exchange, but we can say that it is through breathing that all animals move nutrients directly into the air through breathing. In more complex animals, there are structures capable of oxygen uptake, such as skin, trachea, gills and lungs.
A physiological procedure, which provides the body with oxygen and discharges carbon dioxide is known as breathing. In the process, the pulmonary alveoli, which are situated in the lungs permit the exchange of respiratory gases between the blood, that is, the internal medium and the air or the atmosphere, that is, the external environment.
