ArteriolesVasodilationBiological FactorsPia MaterDilatationVasodilator AgentsEsophageal StenosisNitric OxideNitroprussideRats, Long-EvansNitroarginineCerebral ArteriesMiddle Cerebral ArteryAcetylcholineEndothelium, VascularAminoacylationNitric Oxide DonorsReceptors, Purinergic P2Y2Barium CompoundsReceptors, Purinergic P2Y1MiconazoleEsophageal AchalasiaGlycyrrhetinic AcidMesocricetusVasomotor SystemHydrazinesEnzyme InhibitorsGlutamine-Fructose-6-Phosphate Transaminase (Isomerizing)Small-Conductance Calcium-Activated Potassium ChannelsPotassium Channel BlockersGap JunctionsNG-Nitroarginine Methyl EsterPupilConnexinsMuscle, SkeletalIndomethacinVascular ResistanceMicroscopy, VideoVasoconstrictionAdenosineMuscle, Smooth, VascularNitric Oxide Synthase Type IIICoronary VesselsMicrocirculationRats, WistarIonophoresStress, MechanicalBradykininUridine TriphosphatePotassium ChannelsCatheterizationDose-Response Relationship, DrugNitric Oxide SynthaseConstriction, PathologicHyperemiaArteriesProstaglandinsCerebrovascular CirculationReceptors, Purinergic P2Second Messenger SystemsSuperoxidesCalcimycinCyclic GMPCricetinaeSwineAdenosine TriphosphateBlood PressureArginineMice, KnockoutMuscle ContractionCalciumRats, Sprague-DawleyHypertensionMice, Inbred C57BLMembrane PotentialsSignal Transduction