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- Oxygen : A chemical element with the symbol O and atomic number 8.
- 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.
- Suffocation : Add brief definition or description
- Hyperoxia : An increased partial pressure of oxygen in the blood.
- Hypocapnia : A decreased partial pressure of carbon dioxide 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
- Carbon dioxide : Chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom.