FLUID COMPARTMENTS

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-Intracellular fluid
-Extracellular fluid:
-intravascular,
-interstitial compartments

EXCHANGE BETWEEN FLUID COMPARTMENTS
-diffusion through cell membranes
-diffusion through capillary endothelium

General
At birth:  75% of total body weight is water
At 1month:  65%of total body weight is water
Adult male:  60% of total body weight is water
Adult female:  50% of total body weight is water

Volume of fluid within a compartment is determined by:
-solute composition
-concentration of solute