Blood CirculationExtracorporeal CirculationPulmonary CirculationCollateral CirculationEnterohepatic CirculationCoronary CirculationCerebrovascular CirculationPlacental CirculationSplanchnic CirculationBlood Circulation TimeLiver CirculationRegional Blood FlowBlood Flow VelocityVascular ResistanceHemodynamicsBlood PressureCross CirculationAssisted CirculationTime FactorsDogsHeart ArrestRenal CirculationCardiopulmonary ResuscitationPulmonary ArteryPregnancyLiverPlacentaMaternal-Fetal ExchangeMetabolic Clearance RateVasodilationTissue DistributionLaser-Doppler FlowmetryInjections, IntravenousVertebrobasilar InsufficiencyVeinsVasoconstrictionMicrocirculationFontan ProcedureFetusArteriesHalf-LifeCerebral ArteriesCardiac OutputPerfusionVasodilator AgentsPortal SystemLungOxygenBronchial ArteriesSheepNitric OxideRabbitsSwineRats, Sprague-DawleyCerebral AngiographyCoronary VesselsDisease Models, AnimalPolyethylene GlycolsBlood VesselsEndothelium, VascularPulsatile FlowRetinal ArteryErythrocytesVertebral ArteryModels, CardiovascularBileHeart RateBasilar ArteryAnoxiaCarbon DioxideBlood VolumeDrug CarriersParabiosisLiposomesBile Acids and SaltsTreatment OutcomeRetinal VesselsHypertension, PulmonaryRats, WistarMice, Inbred C57BLSerum Albumin, Radio-IodinatedOxygen ConsumptionPersistent Fetal Circulation SyndromeKidneyChoroidPoliomyelitisDose-Response Relationship, DrugCardiopulmonary BypassPartial PressureInjections, Intra-ArterialBrainVenous PressureDuctus ArteriosusPapioHypothermia, InducedModels, BiologicalErythrocyte AgingUmbilical ArteriesMagnetic Resonance AngiographyInfarction, Posterior Cerebral Artery