BaroreflexBlood PressureHeart RatePressoreceptorsSympathetic Nervous SystemPhenylephrinePressureCarotid SinusReflexNitroprussideArterial PressureCentral Venous PressureHemodynamicsHypertensionFourth VentricleVagus NerveArteriesLower Body Negative PressureVascular ResistanceDenervationKidneySolitary NucleusVasoconstrictor AgentsAutonomic Nervous SystemConsciousnessCardiovascular SystemHeartCardiac OutputAntihypertensive AgentsValsalva ManeuverAngiotensin IIRats, Sprague-DawleyMedulla OblongataRats, Inbred SHRBlood Pressure DeterminationHydrostatic PressureDizzinessSupine PositionVasodilator AgentsAutonomic PathwaysDogsRegional Blood FlowAutonomic AgentsGuanabenzTilt-Table TestCarotid ArteriesPostureInjections, IntraventricularNitroglycerinLumbosacral RegionVagotomyNorepinephrineRabbitsHypotensionAdrenergic FibersBlood VolumeMuscle, SkeletalLosartanHeat Stress DisordersRats, Inbred WKYParasympathetic Nervous SystemTime FactorsForearmRestCardiac Resynchronization Therapy DevicesModels, ChemicalIntracranial PressureArginine VasopressinBradycardiaAortaVasoconstrictionGanglionic BlockersExerciseHematocritPulseAtropineCardiovascular Physiological PhenomenaElectrocardiographyPhysical Conditioning, AnimalBlood Pressure Monitoring, AmbulatoryTrimethaphanRats, WistarReference ValuesReninTransducers, PressureInjections, IntravenousVenous PressureIntraocular PressureAfferent PathwaysDose-Response Relationship, DrugHeart FailureSodium ChlorideCold TemperatureRenal CirculationCardiotonic AgentsInfusions, IntravenousRespirationTelemetryCarotid BodyHypotension, Orthostatic