•Two factors are regulated to maintain fluid balance:
•Important to prevent swelling or shrinking of cells
•Control of water balance is of primary importance
•Important to maintain blood pressure
•Control of salt balance is of primary importance
- -Extracellularfluid serves as the intermediary between cells and the extracellularenvironment.
- •Plasma is the only fluid that can be acted on directly to control its volume and composition.
- •Because of free exchange across capillary walls, ECF volume and composition are regulated when plasma volume and composition are.