NephronsPlacental CirculationUmbilical ArteriesPregnancy Trimester, ThirdBlood Flow VelocityUltrasonography, DopplerRegional Blood FlowPregnancyOligohydramniosPlasma VolumePolyhydramniosBlood VolumeAmniotic FluidExtracellular SpaceBody FluidsKidney Tubules, DistalExtracellular FluidFluid ShiftsWater-Electrolyte BalanceKidneyKidney TubulesAbsorptionIsotonic SolutionsSodiumInulinBody WaterKidney Tubules, ProximalFluid TherapyKidney Tubules, CollectingGlomerular Filtration RateDiuresisBody Fluid CompartmentsLoop of HenleNatriuresisSodium ChlorideDehydrationBlood Volume DeterminationKidney GlomerulusWater-Electrolyte ImbalanceAmputation StumpsHydrostatic PressureOsmolar ConcentrationOrgan SizeBlood PressureUltrasonography, PrenatalElectrolytesEpithelial Sodium ChannelsElectric ImpedanceExtravascular Lung WaterHematocritUrineAlkalosisAldosteroneStroke VolumeFurosemideLung Volume MeasurementsGestational AgeUreterPotassiumProsthesis FittingLymphatic SystemDiureticsTime FactorsWater DeprivationPressureDogsKidney MedullaPlasma SubstitutesNephrectomyRadioisotope Dilution TechniqueEdemaKidney CortexDye Dilution TechniquePuncturesMagnetic Resonance ImagingOsmosisHemodynamicsBicarbonatesImaging, Three-DimensionalHypernatremiaOsmotic PressureBody Surface AreaChloridesErythrocyte VolumeAstronautsHypertonic SolutionsRats, Inbred StrainsReninWaterHypovolemiaChromium RadioisotopesRats, Sprague-DawleyWeightlessnessSheepRehydration SolutionsReproducibility of ResultsCapillary PermeabilityMannitolOrganogenesisAmiloride