Nitric Oxide DonorsNitroprussideNitric OxideMolsidomineNitric Oxide SynthaseS-Nitroso-N-AcetylpenicillaminePenicillamineVasodilator AgentsNitroso CompoundsFerricyanidesCyclic GMPS-NitrosoglutathioneVasodilationNG-Nitroarginine Methyl EsterNitric Oxide Synthase Type IINitrogen OxidesOxadiazolesNitric Oxide Synthase Type IIIGuanylate CyclaseNitroglycerinomega-N-MethylarginineIsosorbide DinitrateEnzyme InhibitorsSodiumAcetylcholineArginineEndothelium, VascularMuscle RelaxationDose-Response Relationship, DrugHydrazinesNitric Oxide Synthase Type INitroarginineForearmNitratesNitritesNitro CompoundsQuinoxalinesRats, WistarRats, Sprague-DawleyVasoconstrictor AgentsPhenylephrineTriazenesCyclic GMP-Dependent Protein KinasesTissue DonorsBlood PressureS-NitrosothiolsSydnonesVasoconstrictionSpermineMuscle, Smooth, VascularRegional Blood FlowMethylene BlueAorta, ThoracicHypotension, ControlledPurinonesCells, CulturedBradykininVascular ResistanceHydroxocobalaminRabbitsFree Radical ScavengersAmino Acid OxidoreductasesAortaMesenteric ArteriesBlood DonorsRuthenium CompoundsArteriesNicorandilCromakalimIndazolesHemodynamicsLiving DonorsSodium ChannelsPyrogallolMuscle ContractionPlacental Function TestsCyclic Nucleotide Phosphodiesterases, Type 5Time FactorsHeart RateMuscle, SmoothPentaerythritol TetranitrateTrimethaphanArteriolesSwineDogsPhosphodiesterase InhibitorsGlutathioneCoronary VesselsAzo CompoundsSuperoxidesSodium NitriteNitrosationOxidative StressGlyburideMicrocirculationPlethysmographyNorepinephrineCalciumPotassium ChannelsVasomotor System