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HOMEOSTASIS Claude Bernard, a famous French physiologist pointed out in 1859 that plants and animals live in different environments like deserts , snowmountain grassland etc. The surrounding in which an organism live is called external environment and the environment in which a organism's cell live is called its internal environment . The internal environment is a fluid filled called tissue fluid which bathes the cells of body . So maintaining the internal environment constant for cell functioning is called Homeostasis. What is homeostasis Ans The mechanism in which the internal environmental conditions of a cell or an organism are maintained properly by means of self regulatory processes called Homeostasis . The external environment or conditions in which an organism lives may fluctuate continuously . The components of external environment are temperature , water , acidity etc . Similarly tissue fluid and sap are the internal environment of animals and plants respe...

the important aspect of internal environment that must be kept constant are : Osmoregulation it is the control of the gain and loss of water and dissolved solute Excretion removal of excess and unwanted products from cell Thermoregulation it is the maintenance of internal temperature within range that allows cell to function efficiently Feed back system There are number of of physiological proceses functioning in the body to maintain the homeostasis . Homeostasis require check and balance . The check and balance mechanism is called feed back system . Usually hormones control this feed back system but it is ultimately controlled by nervous system . When any change in the internal environment takes place , it is detected by receptors and immediately reported to control center (Brain) which decides about appropriate response and sends its instructions to effector , which plays its role and brings the substance back to normal . The feed back mechanism may be negat...

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