Origin: Anc Greek όμοιος/hοmoios(=same) + στάσις/ stαsis(=standing still, state) à same state
|Claude Bernard (1813-1877)|
Coined: The first who defined the idea of homeostasis was Claude Bernard (1813-1877) who wrote in 1926:
“I think I was the first to urge the belief that animals have really two environments: a milieu extérieur in which the organism is situated, and a milieu intérieur in which the tissue elements live. The living organism does not really exist in the milieu extérieur (the atmosphere it breathes, salt or fresh water if that is the element) but in the liquid milieu intérieur formed by the circulating organic liquid which surrounds and bathes all the tissue elements;
The term was coined by American Walter Bradford in 1920s
"I have suggested a special designation for these states, homeostasis. The word does not imply something set and immobile, a stagnation. It means a condition—a condition which may vary, but which is relatively constant.”
is the property of a system to maintain a constant and stable internal enviroment against disturbances from the outside. Homeostasis regards many parameters and mechanisms of body functions including blood glucose level, temperature, water content of the body, and the amount of carbon dioxide and urea being carried by the blood.