Plants and animals are found in desert snow,mountains,grasslands, almost in all types of environments.The surroundings in which the organism live is called its environment.The environment in which the organism live is known as the external environment and the environment in which the individual cells live is known as the internal environment. The ability to maintain a steady state within a constantly changing environment is essential for the survival of living system.In order to maintain this condition organisms from simplest to the most complex one have to developed a variety of structural,physiological and behavioral mechanism designed to achieve a constant internal environment. The maintenance of a constant internal environment is called homeostasis.(Greek: homois, like, resembling and stasis, standing). This term was introduced by Walter Canon In 1932.
The three elements of homeostasis are:
(a) Osmoregulation: it is the control of gain and loss of water and dissolved solutes.
(b) Excretion: The disposal of nitrogen containing wastes.
(c) Thermoregulation: it is the maintenance of internal temperatures within a range that allows cells to function efficiently.
The three elements of homeostasis are:
(a) Osmoregulation: it is the control of gain and loss of water and dissolved solutes.
(b) Excretion: The disposal of nitrogen containing wastes.
(c) Thermoregulation: it is the maintenance of internal temperatures within a range that allows cells to function efficiently.
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