Muscle RelaxationRelaxationVasodilationRelaxation TherapyVasodilator AgentsNitroprussideAcetylcholineEndothelium, VascularAorta, ThoracicMuscle ContractionMuscle, SmoothNitric OxideMesenteric ArteriesEndothelium-Dependent Relaxing FactorsMuscle, Smooth, VascularVasoconstrictor AgentsNitroarginineMind-Body Relations, MetaphysicalTracheaPhenylephrineVasoconstriction15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidDose-Response Relationship, DrugBiological FactorsPenisPulmonary ArteryProstaglandin Endoperoxides, SyntheticNG-Nitroarginine Methyl EsterOxadiazolesAortaIsoproterenolGuanylate CyclaseBradykininNitric Oxide SynthaseNitric Oxide DonorsPotassium ChlorideNitric Oxide Synthase Type IIIRabbitsCyclic GMPNorepinephrineArteriesPotassium Channel BlockersGuinea PigsArginineEnzyme InhibitorsCoronary VesselsAdrenergic beta-AgonistsIndomethacinRats, WistarSwine, MiniatureCarbacholRats, Inbred WKYNitroglycerinRats, Sprague-DawleyReceptors, Adrenergic, betaIsometric ContractionRats, Inbred SHRElectric StimulationSerotoninSwineMethacholine ChlorideBlood PressureCyclooxygenase InhibitorsDogsPropranololPotassium ChannelsHypertensionCalciumDiabetes Mellitus, ExperimentalMagnetic Resonance SpectroscopyBody WeightGastric FundusMyocardial ContractionMice, Inbred C57BLMethylene BlueCharybdotoxinDiastoleApaminEsophageal Sphincter, LowerMuscle TonusVasoactive Intestinal PeptideEsophagogastric JunctionQuinoxalinesNuclear Magnetic Resonance, BiomolecularCromakalimMolsidomineGlyburideBasilar ArteryPhenoxyacetatesomega-N-MethylarginineTime FactorsManometryGuanethidineVentricular Function, LeftKineticsPressureCalcimycinAtropineDiazonium CompoundsPotassium