Fluid - since electrolytes dissociate into 2 or more ions...

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Body Fluids - Body Water Content : o infants ≥ 73% water; normal adult males ~ 60%; normal adult females ~ 50%; elderly ~ 45% o skeletal muscle more hydrated (~ 65% water) than adipose tissue (≤ 20% water) - Fluid Compartments : o Intracellular fluid (ICF) : water within cells of the body; ~ 62% of body’s water o Extracellular fluid (ECF) : water in the body outside cells Plasma : fluid component of blood; ~ 8% of body’s water Interstitial fluid (IF) : fluid in spaces between tissue cells; ~ 30 of body’s water usually includes lymph, CSF, synovial fluid, serous fluid, etc… - Composition of Body Fluids: o nonelectrolytes : molecules that have no electrical charge; do not dissociate in electrolytes : molecules that do dissociate in water into charged particles (e.g.:
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Unformatted text preview: since electrolytes dissociate into 2 or more ions in water, they have the greatest ability to cause osmotic movement of water o Comparison of Intracellular & Extracellular Fluids extracellular fluid : chief ions are sodium cations (positive ions) & chloride anions (negative ions) intracellular fluid : chief ions are potassium cations & phosphate anions (negative ions) cellular ATP-dependent sodium-potassium pumps maintain balance (keep sodium ions outside cell & potassium ions inside cell) since ions are generally small molecules, proteins & large nonelectrolytes (mostly lipids) are the bulk of the mass of dissolved solutes in body fluids- Fluid Movement Among Compartments o exchanges between plasma & interstitial fluid occur across capillary membranes o exchanges between interstitial & intracellular fluids occur by passive transport (osmosis & diffusion) & active transport Page1...
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Fluid - since electrolytes dissociate into 2 or more ions...

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