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In a unicellular organism, the interior region of the organism is no longer in contact with the external environment. Thus simple processes of diffusion, phagocytosis, exocytosis and contact with sea water helped in exchanging the necessary molecules and nutrients. But a further increase in size and complexity of the organism lead to concentration of the pool of cytoplasm. The fluid in-between the cells was known as interstitialfluids.
These fluids, due to constant exchange of molecules between the various cells lead to changes in the internal environment which influenced the functioning of the cell. Physiology, we learnt earlier, is concerned with such basic activities as reproduction, growth, metabolism, excitation and contraction as they are carried out within the fine structure - the cells, tissues, organs and organ systems of the body. The various body systems of our body are enumerated next.
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Peripheral nervous system (pns): Except for the brain and the spinal cord, the rest of the network of nerves and neurons is included in tha peripheral nervous system, or
Explain the Hypersecretion during childhood Hypersecretion during childhood: Due to an increased secretion of the growth hormone, gigantism occurs. There is an excessive skelet
A balance barometer This device depends on the fact that dry air is heavier than moist air at the similar temperature. Two equal cylinders (tin cans would do) are mounted, o
Softening water with chemicals Try making suds with a half test tube of hard water and a few drops of soap solution. Next boil a same sample and again try to make suds by usin
Applications of Laser: Due to its properties, laser light can be put to a number of uses in industry, medicine, communications etc. We will briefly describe some of these us
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Air Borne Diseases: A number of diseases are caused due to bacteria and virus that are carried in the air. When an infected person sneezes or coughs, there is a noticeable spr
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What is the rock cycle explain breifly? The rock cycle is the full "life" of a rock from its original formation to its demise through weathering, and rebirth through recrystall
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