- The exchange of oxygen and carbon dioxide in the body.
Definition from: Omaha System via Unified Medical Language System at the National Library of Medicine
- 1: a: the movement of respiratory gases (as oxygen and carbon dioxide) into and out of the lungs. b: a single complete act of breathing <30 respirations per minute>.
2: The physical and chemical processes (as breathing and diffusion) by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions.
3: Cellular respiration.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
Related discussion in the Handbook
See also Understanding Medical Terminology.