The processes of respiration and breathing serve to provide oxygen to the body cells. This oxygen is used in the process of metabolic oxidation. In metabolic oxidation, the energy trapped in glucose molecules is released for use in the body's activities.
Also, the carbon dioxide (CO2) produced during metabolic oxidation and any other unwanted gases are removed from the body.
In general, respiration is the exchange of gases. In the human body, two kinds of respiration take place.
External respiration. In external respiration, gases are exchanged between the blood and the surrounding air.
Internal respiration. In internal respiration, gases are exchanged between the blood and the individual cells of the body.
On the other hand, breathing is the process by which air is moved into and out of the lungs.
Types. In humans, there are two types of breathing. In costal breathing, the rib cage is used. In diaphragmatic breathing, there is reciprocal interaction between the diaphragm and the abdominal wall.
Direction of air flow. When the air flows inward, we call it inhalation. When the air flows outward, we call it exhalation.