ENDOCRINE SYSTEM
Beside the nervous system in the body activities are also controlled by chemicals called hormones they are secreted by the specialized ductless glands endocrine glands these glands pour their secretions directly into the blood various endocrine glands are pituitary thyroid parathyroid thymus suprarenal (adrenal )testes ovaries placenta and the pancreas
Althrough different organ system are functionally independent they are interdependent on each other for example bones joints and ligaments are all concerned with movement the movement is not only necessary for locomotion but also for various functions like circulation respiration and propulsion of food for digestion etc the muscular system itself is controlled by the nervous system the vitality of which is dependent on adequate supply of oxygen through the blood the nervous system controls all other system of the body and thus reigns supreme these few illustration show that the human physiological system work in co operation and co ordination
HOMEOSTASIS::: The human body apparently looks solid like but it holds within it nearly 70 percent of water in the form of plasma lymph tissue fluid and transcellular fluid in human body the composition of blood and body fluids generally vary with respect to gases and solids within very narrow limits various organs such as skin kidneys lungs endocrine glands etc interact in the most complex manner and carry out their functions with such precision that the relative consistency is maintained among body fluids they respond with the utmost delicacy to any condition which tend to cause any departure from the normal state this mechanism regulating the integrity of body fluids is tremed as homeostasis it is the keystone to longevity of life one of the classical example of homeostasis is the maintenance of the blood glucose level within narrow limits any factor which tends to increase or decrease blood sugar level will result in to activation of counteracting mechanisms this inturn leads to normalization of the blood sugar level how two hormones of pancreas viz insulin and glucagon maintain the blood sugar level
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