Homeostasis: (Homo - same, stans : to stay) It is a method of maintaining of internal enviorment of on orgamism within a suitable limits.
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The external enviroment or the conditions in which an organism lives, ay vary greatly even over a brief period of time. Temperature, acidity, salts water etc. It defined as a set of regulatory mechanism, which are involved in maintaining an orgamisms internal enviroment within suitable limits. The word eniroment refers to the conditions in which an organism lives. Thus the pond water inhabited by an Amoeba is its enviroment. Similarly, tissue fluid and sap are the enviroments of higher animals and plants, respectively. From the tissue fluids, cells not only receive all the substances they need, but also release into it their unwanted substances.
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