The process in the body that produces carbon dioxide consists of air being taken into the lungs, known as inspiration or inhalation. The air is then taken back out, known as expiration or exhalation.
Carbon dioxide is a waste gas produced when carbon combines with oxygen associated with energy-making processes in the body. Respiration is a term given to exchanges of oxygen found in the environment for the carbon dioxide from cells in the body. The respiratory system and the lungs allow for oxygen present in air to be absorbed by the body and allows the release of the waste gas carbon dioxide in air that is breathed out.