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Ch+27.+Fluid+Electrolyte+AB.pdf - Fluid, Electrolyte, &...

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Fluid, Electrolyte, & Acid-­‐BaseHomeostasisCh. 27Dr. Clay
Fluid Compartments and FluidHomeostasisIn adults, body fluids makeup between 55% and 65% oftotal body massBody fluids are present intwo main compartments—inside cells (2/3) and outsidecells (1/3)Intracellular fluids is cytosolExtracellular fluid is intersOOalfluid (80%) and blood plasma(20%)
Fluid Compartments and FluidHomeostasisTheplasma membraneofcells separates intracellularfluid from intersOOal fluidBlood vessel wallsdividethe intersOOal fluid fromblood plasmaCapillary wallsare thinenough to allow exchangeof water and solutesbetween blood plasma andintersOOal fluid
Fluid Compartments and FluidHomeostasisFiltraOon, reabsorpOon,diffusion, and osmosis allowconOnuous exchange of waterand solutes among body fluidcompartmentsThe balance of inorganiccompounds that dissociate intoions (electrolytes) is closelyrelated to fluid balanceThe body gains water by ingesOonand metabolic synthesisThe body loses water viaurinaOon, perspiraOon,exhalaOon, and in feces
Fluid Compartments and FluidHomeostasisThe level of aerobic respiraOon determinesthe volume of metabolic water formedThe amount of water formed is directlyproporOonal to the amount of ATP producedWhen water loss is greater than water gain,dehydraOon occurs leading to increased thirst
The Thirst Response
Fluid Compartments and FluidHomeostasisEliminaOon of excess body water occursthrough urine producOonThe amount of urinary salt loss is the mainfactor determining body fluid volumeThe two mainsolutesin urine aresodium ions(Na+)andchloride ions (Cl)Wherever solutes go, water follows
Fluid Compartments and FluidHomeostasis3 major hormones control renal Na+and Cl:1.

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Term
Fall
Professor
Chowdary
Tags
Plasma

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