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Feb 8 - Ch 7 electrolytes.doc

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University of Alberta
Sabina Valentine

Feb 8: Ch7 – nutrients involved in Fluid and Electrolyte Balance Fluids • Substances composed of freely moving molecules • Have the ability to conform to the shape of their container There are different types of fluids in our bodies • 50-70% of a healthy adults body is composed of fluids • About 2/3 of this fluid is within body cells and is called intracellular fluid • The remaining 1/3 is extracellular fluid (can be tissue fluid, or interstitial fluid) Extracellular fluids include: • Tissue fluid found between the cells within tissues and organs of the body • Plasma, the fluid portion of blood that carries the blood cells The body fluid composition of tissue varies by • Tissue type – lean tissues have higher fluid content than fat tissues • Gender – males have more lean tissue and therefore more body fluid • Age – lean tissue is lost with age and body fluid is lost with it Electrolytes Body Fluid is composed of • Water • Electrolytes: mineral salts dissolved in water, including: sodium, potassium, chloride, and phosphorus Electrolytes carry electrical charges: • Sodium (Na+) and potassium (K+) are positively charged • Chloride (CL-) and phosphorus (as HPO4, phosphate) are negatively charged • Fluids have an overall neutral charge due to the balances between electrolytes • In intracellular fluid, K+ and HPO4 are the predominant electrolytes • In extracellular fluid, NA+ and Cl- predominate Functions of Fluids Fluids dissolve and transport substances • Water is an excellent solvent because it can dissolve many different substances • The dissolved materials or solutes include ions, sugars, amino acids, vitamins and minerals Fluids account for blood volume • Blood volume is the amount of fluid in the blood
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