PhenylephrineAdrenergic alpha-AgonistsAdrenergic alpha-1 Receptor AgonistsVasoconstrictor AgentsReceptors, Adrenergic, alpha-1Receptors, Adrenergic, alphaEphedrinePrazosinVasoconstrictionAdrenergic alpha-AntagonistsMydriaticsAorta, ThoracicSympathomimeticsAdrenergic alpha-1 Receptor AntagonistsHydrogen-Ion ConcentrationBaroreflexBlood PressureAdrenergic AgonistsIsoproterenolDose-Response Relationship, DrugNitroprussideNorepinephrineBiological ProductsMuscle, Smooth, VascularClonidineVasodilator AgentsReceptors, AdrenergicTropicamideMuscle ContractionMolecular Sequence DataRats, Sprague-DawleyMethoxamineMesenteric ArteriesVasodilationPropranololPotassium ChlorideAnesthesia, ObstetricalPressoreceptorsRats, WistarHeart RateRabbitsKineticsAnesthesia, SpinalPhentolamineEpinephrineCalciumNitric OxideRats, Inbred StrainsHypotensionAcetylcholineSympathetic Nervous SystemYohimbineDioxanesAmino Acid SequenceBase SequenceAortaEndothelium, VascularMuscle RelaxationEnzyme InhibitorsArteriesAdrenergic beta-AgonistsNG-Nitroarginine Methyl EsterVasopressinsDogsTailCells, CulturedPupilPhenoxybenzamineTime FactorsDairy ProductsStimulation, ChemicalNitric Oxide SynthaseRegional Blood FlowOxymetazolineAngiotensin IIHeartPenisVascular ResistanceEscherichia coliHemodynamicsQuinoxalinesMyocardiumMetaproterenolLiverNitroarginineCardiomegalyCloning, MolecularMyographyReceptors, Adrenergic, alpha-2PerfusionMuscle, SmoothConsumer Product SafetyCardiotonic AgentsChromatography, High Pressure LiquidIndomethacinMuscle TonusReceptors, Adrenergic, betaCesarean SectionEndothelin-1Adrenergic alpha-2 Receptor Agonists