Total body water: is total amount of water present in the body. In average human about 65-70% of body weight is water only.
Extra cellular fluid:is that fluid which is present outside the cells for example plasma. Lymph, interstitial fluid etc. It constitutes about 15-20% of body weight.
Intracellular fluid: is the fluid present inside various body cells. It constitutes about 50% of body weight.
Osmosis: is movement of water from a region of low solute concentration to higher solute concentration through semi permeable membrane.
Osmotic pressure:is the pressure that must be applied on a solution to prevent the flow of pure solvent into it when two are separated by a semi permeable membrane.
Hydrostatic pressure: is force exerted by the fluid on wall of blood vessels or compartment in which it is filled.
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