<prompt> 5 g mannitol was injected intravenously. 40 of mannitol is excreted. After equilibrium, plasma concentration of mannitol is 30 mg. Calculate extracellular fluid volume.10 L14 L18 L24 L  <response>: The volume of water in different compament can be measured by volume of distribution principle indicator dilution principle. Where v Volume of fluid Q Quantity of indicator given C Concentration of the indicator e The amount of indicator which has either been lost or metabolized 30 mg 30 mg 100 mL 300 mg L 0.3gL Quantity of mannitol excreted 5 40100 2 g ECF volume 5 - 2 0.3 3 0.3 10 L 