Body water is contained with in two major physiological reservoirs (compartments).
1. Intracellular fluid % about 40% of body weight (25 liter)
2. Extra cellular fluid about 20% of body weight (20 liters) in which:
a) 5 liter in intra vassal
b) 15 liter interstissual – tissue space the space between blood and the cells. A part from this the extra cellular fluid contains other fluids, which are usually negligible, considering their concentration in the body. These are CSF, ocular fluid, cynovial fluid, pleural fluid, and pericardial fluid, peritoneal fluid.
Water Balance
Normal body water is in a dynamic state. There is constant loss and constant replacement. i.e., intake is equal to output.
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