VasodilationVasodilator AgentsForearmNitric OxideArteriolesNitroprussideEndothelium, VascularRegional Blood FlowAcetylcholineIon ChannelsVascular ResistanceBrachial Arteryomega-N-MethylarginineHyperemiaNitroglycerinNitric Oxide SynthaseCoronary CirculationCoronary VesselsVasoconstrictionNG-Nitroarginine Methyl EsterBlood Flow VelocityIon Channel GatingIon TransportBlood PressureAdenosineLaser-Doppler FlowmetryVasomotor SystemEnzyme InhibitorsMicrocirculationHemodynamicsEndothelium-Dependent Relaxing FactorsDose-Response Relationship, DrugMesenteric ArteriesDogsHeavy IonsBradykininNitric Oxide Synthase Type IIINitroarginineVasoconstrictor AgentsIndomethacinPlethysmographyPia MaterBiological FactorsArginineInfusions, Intra-ArterialSkinCyclooxygenase InhibitorsRats, Sprague-DawleyPotassium ChannelsPulmonary CirculationBretylium TosylatePotassium Channel BlockersMuscle, Smooth, VascularNitric Oxide DonorsArteriesHeart RatePapaverineCerebral ArteriesSweatingGlyburideAnoxiaSkin TemperaturePotassiumMyographyCalcitonin Gene-Related PeptideCyclic GMPBody Temperature RegulationSwineRenal CirculationPotassium ChlorideIsosorbide DinitrateCerebrovascular CirculationProstaglandinsCalcium15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidBlood VesselsTime FactorsFlushingGuanylate CyclaseRats, WistarNorepinephrinePurinergic P1 Receptor AntagonistsPhenylephrinePulmonary ArteryNitritesHypertensionPerfusionSpectrometry, Mass, Secondary IonIon PumpsRetinal ArteryHydrazinesOxygen ConsumptionOxygenMethacholine ChlorideMuscle, SkeletalIon ExchangeEndothelin-1SodiumSplanchnic CirculationSkin Physiological Phenomena