BIOL 1221 Lecture Notes - Lecture 4: Body Water, Body Fluid, Osmotic Power
16 Apr 2016
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Luid inside cells accounts for 2/3 of total body luid: extracellular luid (ecf) compartment: Fluid outside cells accounts for one-third of total body luid. 2 ecf compartments: plasma: 3 l. Interstitial luid (if): 12 l in spaces between cells. Composition of body fluids: water: universal solvent, solutes: substances dissolved in water. Nonelectrolytes: most organic molecules: do not dissociate in water, e. g. glucose, lipids, creatinine, and urea. Electrolytes: dissociate into ions in water, e. g. inorganic salts, all acids and bases, some proteins. Ions conduct electrical current: greater osmotic power than nonelectrolytes. Greater ability to cause luid shifts due to ability to dissociate into two or more ions. Body fluid compartments: concentrations are expressed in milliequivalents per liter (meq/l): measure of electrical charges per liter of solution. Extracellular and intracellular fluids: electrolytes are most abundant solutes in body luids. Determine most chemical and physical reactions: bulk of dissolved solutes (take up most space) consists of proteins, phospholipids, cholesterol, and triglycerides.
