Concentration expressed as:moles per kilogram of solvent.Percent Concentrations: (Solute / Solvent) x 100 Water moves according to osmotic gradients.

Electrolytes have greater osmotic power than nonelectrolytes.Nonelectrolytes вЂ“ examples include glucose, lipids, creatinine, and urea.Electrolytes вЂ“ inorganic salts, all acids and bases, and some proteins.Other ECF вЂ“ lymph, cerebrospinal fluid, eye humors, synovial fluid, serous fluid, and gastrointestinal secretions.Interstitial fluid (IF) вЂ“ fluid in spaces between cells.Plasma вЂ“ the fluid portion of the blood.Extracellular fluid (ECF) вЂ“ consists of two major subdivisions.Intracellular fluid (ICF) вЂ“ about two thirds by volume, contained in cells.Water occupies two main fluid compartments.Increases in plasma osmolality trigger thirst and release of antidiuretic hormone (ADH).Metabolic water or water of oxidation (10%).Ingested fluid (60%) and solid food (30%).To remain properly hydrated, water intake must equal water output.In old age, only about 45% of body weight is water.Healthy males are about 60% water healthy females are around 50%.Total water content declines throughout life.Infants have low body fat, low bone mass, and are 73% or more water.Physiology, University of Inonu Faculty of Medicine Body Fluid Compartments & Physiological Solutions By Halil DГњZOVA, M.D.

Measuring body fluid compartments