VasoconstrictionVasoconstrictor AgentsVascular ResistanceRegional Blood FlowPulmonary CirculationAnoxiaBlood PressurePulmonary ArteryArteriolesVasodilationNorepinephrineEndothelin-1ShiveringRenal CirculationSkin TemperatureForearmPhenylephrineMesenteric ArteriesHemodynamicsBody Temperature RegulationVasomotor SystemMuscle, Smooth, VascularReceptors, EndothelinAdrenergic alpha-AgonistsVasodilator AgentsAdrenergic alpha-1 Receptor AgonistsSympathetic Nervous SystemNitric OxidePerfusionEndothelinsDogsAdrenergic alpha-AntagonistsDose-Response Relationship, DrugReceptor, Endothelin AArteriesAngiotensin IIReceptor, Endothelin BRats, Sprague-DawleyNG-Nitroarginine Methyl EsterReceptors, Adrenergic, alphaHeadache Disorders, PrimaryMethoxamineCoronary VesselsTyramineHeart RateSplanchnic CirculationEndothelium, VascularViper VenomsPrazosinMicrocirculationNitric Oxide SynthasePeptides, CyclicPotassium ChlorideMeclofenamic AcidKidneyRats, WistarEnzyme InhibitorsAcetylcholineOxygenPhentolamineHypertension, PulmonaryReceptors, Adrenergic, alpha-1Laser-Doppler FlowmetryIndomethacinNitroprussideBlood VesselsReceptors, ThromboxaneThromboxane A2LungBlood Flow VelocityReceptors, Adrenergic, alpha-2Cold TemperaturePlethysmographyAzepinesRenal ArteryPropranololLower Body Negative PressureSkinrho-Associated KinasesInjections, Intra-ArterialReceptors, Neuropeptide YCoronary CirculationRabbitsSwineMuscle ContractionBlood SubstitutesMuscle TonusTailElectric StimulationCerebral ArteriesSerotoninTime FactorsMyographyReflexomega-N-MethylarginineThromboxanesPhenoxybenzamineSweatingArginineHydrazines