Sympathetic Nervous SystemReflexCentral Nervous SystemSympathectomy, ChemicalReflex, StretchNorepinephrineReflex, AbnormalSympathectomyNervous SystemBlood PressureHeart RateAutonomic Nervous SystemAutonomic Nervous System DiseasesCatecholaminesGanglionic BlockersEpinephrineSympatholyticsCentral Nervous System DiseasesHypertensionDenervationReflex, AcousticPeripheral Nervous SystemReflex, Vestibulo-OcularPressoreceptorsPentolinium TartrateReflex, PupillaryGuanethidineSympathetic Fibers, PostganglionicAdrenergic FibersGanglia, SympatheticPropranololStellate GanglionAdrenergic alpha-AntagonistsHydroxydopaminesBaroreflexNervous System NeoplasmsDecerebrate StateParasympathetic Nervous SystemEnteric Nervous SystemVagus NerveDopamine beta-HydroxylaseNeuronsRats, Sprague-DawleyAdrenergic beta-AntagonistsCentral Nervous System NeoplasmsBrainSympathomimeticsPhentolamineSpinal CordReceptors, Adrenergic, betaRenin-Angiotensin SystemTime FactorsPeroneal NervePrazosinNeuropeptide YElectric StimulationHexamethonium CompoundsAdrenal MedullaNervous System Physiological PhenomenaCold TemperatureNeuroblastomaHemodynamicsElectromyographyHeartClonidineHypertension, RenalHexamethoniumKidneyReninMuscle, SkeletalReceptors, Adrenergic3-IodobenzylguanidineAdipose Tissue, BrownAngiotensin IICatsGanglia, AutonomicAutonomic PathwaysGanglioneuromaVascular ResistanceInjections, IntraventricularGalvanic Skin ResponseReserpineOxidopamineHypothalamusPhenoxybenzamineTrimethaphanHypothalamus, PosteriorPostureRats, Inbred SHRReceptors, Adrenergic, alpha-2Cardiovascular SystemSuperior Cervical GanglionStress, PhysiologicalHypothalamo-Hypophyseal SystemDogsPituitary-Adrenal SystemRegional Blood FlowAdrenal GlandsNervous System DiseasesHypotension, Orthostatic