Regional Blood FlowBlood Flow VelocityFlow CytometryPulsatile FlowGene FlowCerebrovascular CirculationCoronary CirculationRheologyOptic FlowLaser-Doppler FlowmetryFlow Injection AnalysisPeak Expiratory Flow RateVascular ResistanceBlood PressureMicrospheresBlood CirculationModels, CardiovascularTime FactorsHemorheologyMicrocirculationHydrodynamicsUltrasonography, Doppler, ColorXenon RadioisotopesPulmonary CirculationUltrasonography, DopplerCollateral CirculationLiver CirculationStress, MechanicalOxygenPerfusionCardiac OutputRenal CirculationVasodilationOxygen ConsumptionCoronary VesselsCarbon DioxideArteriesPressureReproducibility of ResultsHeart RateBlood VolumeTomography, Emission-ComputedSplanchnic CirculationVasodilator AgentsModels, BiologicalWater MovementsBrainMicrofluidicsEquipment DesignShear StrengthEndothelium, VascularOxygen RadioisotopesMaximal Expiratory Flow RateSensitivity and SpecificityCerebral ArteriesPlethysmographyUltrasonography, Doppler, TranscranialEchocardiography, DopplerNitric OxideCapillariesReference ValuesMicrofluidic Analytical TechniquesXenonSwineAdenosineSheepVasoconstrictionBlood Circulation TimeAir MovementsCells, CulturedHeartIschemiaRats, Sprague-DawleyDose-Response Relationship, DrugFemoral ArteryMagnetic Resonance AngiographyHindlimbWaterFluorescent DyesBlood Gas AnalysisKidneyMiddle Cerebral ArteryPartial PressureLegDisease Models, AnimalRabbitsComputer SimulationEchocardiography, Doppler, ColorImmunophenotypingAnalysis of VariancePulmonary VentilationCarotid ArteriesOphthalmic ArteryBlood ViscosityMagnetic Resonance ImagingImage Processing, Computer-AssistedNitrogen RadioisotopesUmbilical ArteriesProspective StudiesArterioles