The human body, which works like a very efficient, coordinate and tireless machine, carries out many different complex functions at a time. There is rarely a conflict or malfunction between its varies activities (It occurs only in case of diseases). this miracle is achieved by the body's "homeostatic"₁ mechanisms . Homeostasis is maintained mainly by the nervous system and the endocrine system as well as partly by the kidneys. This word is derived from "endo" meaning internal and "crine" meaning secretion. Thus, it's a system of glands which produces"secretions" which are released in the "interior" of the body, i.e, in the blood stream directly. Thee are several endocrine glands (the, ductless glands) present in the body, which pour their secretion directly into the blood stream which in turn carries it to the target organ. This secretion is known as hormone2. The hormone exhibits its specific effect on the target gland, which is located far away from the site of secretion.
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