Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Fluid Compartments  Basic Concepts in the Regulation of Fluids and Electrolytes  All homeostatic mechanisms that monitor and adjust body fluid composition respond to changes in the ECF, not in the ICF  No receptors directly monitor fluid or electrolyte balance  Cells cannot move water molecules by active transport  The body's water or electrolyte content will rise if dietary gains exceed environmental losses, and will fall if losses exceed gains
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