VasoconstrictionNorepinephrineNorepinephrine Plasma Membrane Transport ProteinsVasoconstrictor AgentsSympathetic Nervous SystemVascular ResistanceAdrenergic alpha-AgonistsBlood PressureRegional Blood FlowEpinephrineAdrenergic alpha-AntagonistsReceptors, Adrenergic, alphaCatecholaminesPulmonary CirculationHemodynamicsPhenylephrineVasodilationArteriolesAnoxiaMesenteric ArteriesDogsTyramineAdrenergic Uptake InhibitorsForearmAdrenergic alpha-1 Receptor AgonistsDose-Response Relationship, DrugRats, Sprague-DawleyVasomotor SystemEndothelin-1Heart RatePulmonary ArteryMuscle, Smooth, VascularRenal CirculationReceptors, Adrenergic, alpha-2PrazosinVasodilator AgentsPhentolamineDesipramineAngiotensin IIShiveringSkin TemperatureArteriesBody Temperature RegulationPerfusionReceptors, Adrenergic, alpha-1PropranololNitric OxideReceptors, AdrenergicMethoxamineReceptors, EndothelinYohimbineEndothelinsSerotoninDopamine beta-HydroxylaseAcetylcholineNG-Nitroarginine Methyl EsterReceptor, Endothelin ASplanchnic CirculationPotassium ChlorideRats, WistarSympathomimetics15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidElectric StimulationNitroprussideReceptor, Endothelin BHypertensionAdrenergic FibersCoronary VesselsEndothelium, VascularReceptors, Adrenergic, betaDopamineAdrenergic alpha-2 Receptor AgonistsClonidineKidneyMicrocirculationAdrenergic AgentsCardiac OutputLocus CoeruleusCold TemperatureAdrenergic alpha-2 Receptor AntagonistsHeadache Disorders, PrimaryNitric Oxide SynthaseEnzyme InhibitorsNeuropeptide YBlood VesselsMuscle ContractionVasopressinsRats, Inbred StrainsMeclofenamic AcidViper VenomsRats, Inbred WKYReserpineIndomethacinIsoproterenolSympatholyticsRabbitsAdrenergic alpha-1 Receptor AntagonistsAdrenergic beta-AntagonistsMethoxyhydroxyphenylglycolLower Body Negative Pressure