Formed by the body during metabolism and exhaled by the lungs. Seen in sparkling waters and wines, it is also used in baths as a stimulant to the skin. Combined with oxygen in cylinders, it is used to control breathing in ANAESTHESIA and in the treatment of victims of CARBON MONOXIDE (CO) poisoning.
Measuring the partial pressure of the gas by taking blood for blood gas estimation provides information on the adequacy of breathing. A high partial pressure may indicate impending or actual respiratory failure.