Respiration: The process by which oxygen from the air is exchanged for carbon dioxide produced by the body. It includes the mechanical process of breathing, gas exchange in the lungs, and delivery of oxygen and carbon dioxide via the blood to the interstitial fluids and into and out of the cells.


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Respiration: The act of breathing with the Lungs, consisting of Inhalation, or the taking into the lungs of the ambient air, and of Exhalation, or the expelling of the modified air which contains more Carbon Dioxide than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= Oxygen Consumption) or cell respiration (= Cell Respiration).2

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  1. Source: RDCRN (NCATS/NIH): cms/ rld/ Learn-More/ Glossary
  2. Source: MeSH (U.S. National Library of Medicine)

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