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- Carbon dioxide : Chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom.
- Blood : The body fluid that circulates in the vascular system (i.e., blood vessels). Whole blood includes plasma and blood cells.
- Air : A colorless, odorless and tasteless mixture of gases consisting mostly of nitrogen (N2) and oxygen (O2) which is the part of Earth's atmosphere that humans and all other animals breathe in order to obtain the oxygen needed to sustain life.
- Gas exchange : Add brief definition or description
- Breathing : Add brief definition or description
- Pressure : A ratio equal to the force applied perpendicular to the surface of the area divided by that area (force/area).
- Partial pressure : The pressure which each gas in a gas mixture would have if it alone occupied the same volume at the same temperature.
- Hypoxia : A decreased partial pressure of oxygen in the blood.
- Hyperoxia : An increased partial pressure of oxygen in the blood.
- Hypercapnia : An increased partial pressure of carbon dioxide in the blood.
- Hemoglobin : Iron-containing allosteric protein in erythrocytes of vertebrates, consisting of about 6 percent heme and 94 percent globin; also the clinical measurement of hemoglobin per volume of whole blood, varying with age and sex
- Oxygen : A chemical element with the symbol O and atomic number 8.
- Capnography : Continuous recording of the carbon dioxide content of expired air.
- Blood gas analysis : Test which measures the amounts of oxygen and carbon dioxide in the blood, as well as the acidity (pH) of the blood.
- Anesthesia : Add brief definition or description
- Artificial respiration : Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs.