<unk>  refers to the amount of oxygen in a medium.  In blood it may be taken to be synonymous with saturation, which describes the degree to which the oxygen-carrying capacity of haemoglobin is utilised, normally 98-100%.<unk>  also refers to the process of adding oxygen to a medium such as water or body tissue. Claims have been made that<unk>  of human tissue prevent diseases, including cancer, however some regard these claims as unverifiable.<unk>  of various fluorocarbon liquids has been used successfully in liquid breathing systems, allowing air-breathing animals, including humans, to breathe via liquids for short periods of time.
Oxygenation
Thermoregulation
Heat transfer
Coagulation
Blood flow
Hemostasis
Photosynthesis
Respiration 