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Ch. 24Chapter opener – Renal Glomeruli1. Water Balance2. Electrolyte Balance3. Acid-Base BalanceMaintained by the collective action of:UrinaryRespiratoryDigestiveIntegumentaryEndocrineNervousCardiovascularLymphatic
Fig 4-9, Eckert et al 2002Osmoregulationmaintenance of nearly constant osmotic pressure (OP) in bodyfluids, regardless of OP of external environment.Osmotic PressureSemipermeable membrane(permeable to H20 but not solute)
OsmosisMovement of water from low osmotic pressureto high osmotic pressure.IsosmoticTwo solutions with same osmotic pressureHyposmoticone solution has a lower osmotic pressure than anotherHyperosmoticone solution has a greater osmotic pressure than another
Water BalanceTotal Body Water (TBW)45-75% of body weightFluid Compartments1.65% Intracellular Fluid (ICF)2.35% Extracellular Fluid (ECF)i.Tissue (interstitial ) fluidii.Blood Plasma and Lymphiii.Transcellular Fluid (CSF,synovial, peritoneal, pleural,pericardial fluids etc.)Closely juxtaposedSeparated by selectivelypermeable membranesDiffer in chemical composition
QuestionThe greatest percentage of the body’s water is in

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Term
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pH, ECF

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