Intracellular fluid is found inside the bilayered plasma membrane, and is the matrix in which cellular organelles are suspended, and chemical reactions take place.The intracellular compartment contains on average about 28 liters of fluid, and under ordinary circumstances remains in osmotic equilibrium with the ECF. Outside the plasma membrane the cell is continually bathed in interstitial fluid ,which is the immediate microenvironment that allows for movement of ions, proteins and nutrients across the cell barrier.I was really interested in biology when I was preparing for E20-361 exam.This fluid is not static, but is continually being refreshed and recollected by lymphatic channels. In the average male (70 kg)human body, the interstitial space has approximately 10.5 liters of fluid.One of my friend of EC0-350 exam often talked to me about biology of human body.The main intravascular fluid in mammals is blood which is a complex fluid with elements of a suspension (blood cells), colloid(globulins) and solvent(glucose and ions).The average volume of plasma in the average (70 kg) male is approximately 3.5 liters.It's awesome to pass EX0-101 exam.The volume of the intravascular lumen is regulated in part by hydrostatic pressure gradients,and by readsorbtion by the kidneys.