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The nervous system controls and co ordinates all the system of the body and give us sensations
movements intelligence etc and guides us at every moment both externally and internally with or without our knowledge the endocrine glands are also a great force in the growth and development of our body all these functions of various systems co operate and co ordinate to maintain the homeostasis in our body function
with the knowledge of physiology one can change effectively various function quantitatively by the use of drugs to normalise or vitalise the body when it is diseased drugs are meant to correct the body excesses deficiencies and deviations of functions but unless we know the normal physiological function how can we prepare and use the drugs to correct these function beside the plant kingdom some drugs are also derived form animal source insulin is derived from the pancreas thyroxine from the thyroid gland of animals etc the knowledge of anatomy and physiology provides a scientific approach to extract them form the animals
the science of physiology draws freely form biochemistry and biophysics the biochemical examination of blood and urine may reflect the changes in the body functioning and hence aid in the diagnosis of disease study of biophysics is also useful say hydrostatic and osmotic pressure govern the maintenance of equilibrium of the body fluids
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