Vasodilator AgentsVasodilationNitroprussideNitric OxideAcetylcholineRegional Blood FlowNitroglycerinForearmVascular ResistanceEndothelium, VascularHydralazineBradykininVasoconstrictionHemodynamicsBlood PressureNG-Nitroarginine Methyl EsterEpoprostenolPapaverineCalcitonin Gene-Related PeptideVasoconstrictor AgentsMesenteric ArteriesHyperemiaCoronary CirculationPulmonary CirculationAdenosineHypertension, PulmonaryCoronary VesselsVasomotor SystemSplanchnic Circulationomega-N-MethylarginineNitric Oxide SynthaseDose-Response Relationship, DrugDogsArginineArteriolesEndothelium-Dependent Relaxing FactorsPlethysmographyMuscle, Smooth, VascularAdrenomedullinRenal CirculationCromakalimIndomethacinNitroarginineDipyridamoleMinoxidilPulmonary ArteryIsosorbide DinitrateArteriesBiological FactorsMicrocirculationEnzyme InhibitorsProstaglandinsHeart RateBenzopyrans15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMuscle RelaxationIloprostNorepinephrineBlood Flow VelocityRats, WistarPhenylephrineCyclic GMPMuscle TonusInfusions, Intra-ArterialRats, Sprague-DawleyNitric Oxide DonorsAorta, ThoracicSodium NitritePerfusionCyclooxygenase InhibitorsLaser-Doppler FlowmetryAntihypertensive AgentsHypertensionBrachial ArteryNitric Oxide Synthase Type IIIHindlimb8,11,14-Eicosatrienoic AcidPurinesMethoxamineFerricyanidesSubstance PTolazolineReceptors, Calcitonin Gene-Related PeptideEndothelinsBlood VesselsOxadiazolesPropranololRabbitsNifedipineBretylium CompoundsAngiotensin IIAlprostadilVerapamilBasilar ArteryAortaSulfonesEndothelin-1GlyburideIsoproterenolNicardipine