Vasodilator AgentsPapaverineNitroprussideVasodilationAcetylcholineVascular ResistancePharmacologyPharmacology, ClinicalNitric OxideRegional Blood FlowNitroglycerinForearmDose-Response Relationship, DrugEndothelium, VascularBradykininHydralazineVasoconstrictionHemodynamicsBlood PressureCalcitonin Gene-Related PeptideNG-Nitroarginine Methyl EsterEpoprostenolVasoconstrictor AgentsMesenteric ArteriesDogsAdenosineHyperemiaCoronary CirculationPulmonary CirculationCoronary VesselsHypertension, PulmonaryMuscle, Smooth, VascularArginineVasomotor SystemSplanchnic Circulationomega-N-MethylarginineNitric Oxide SynthaseRats, Sprague-DawleyArteriolesAdrenomedullinEndothelium-Dependent Relaxing FactorsPlethysmographyEnzyme InhibitorsRats, WistarHeart RateBiological FactorsRenal CirculationCromakalimNorepinephrineIndomethacinNitroarginineBenzopyransDipyridamoleProstaglandinsMinoxidilPulmonary Artery15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidIsosorbide DinitrateMuscle RelaxationArteriesMicrocirculationPhenylephrineReceptors, G-Protein-CoupledCyclic GMPCyclooxygenase Inhibitors