Basilar ArteryMuscle RelaxationEndothelium, VascularVasodilationAcetylcholineVasodilator AgentsArteriesNitroprussideNitroglycerinNitric OxideVasoconstrictionVasoconstrictor AgentsMuscle, Smooth, VascularEndotheliumVertebrobasilar InsufficiencyBrachial ArteryDose-Response Relationship, DrugRegional Blood FlowNitric Oxide SynthaseCerebral ArteriesMesenteric ArteriesVertebral ArteryPulmonary ArteryMuscle ContractionReceptors, NicotinicRelaxationReceptors, CholinergicRelaxation TherapyCarotid ArteriesNitroarginineRabbitsalpha7 Nicotinic Acetylcholine ReceptorRenal ArterySubarachnoid HemorrhageDogsBiological FactorsBrain Stem InfarctionsFemoral ArteryPotassium ChlorideEndothelium, CornealCoronary VesselsAorta, ThoracicMuscle, SmoothCalciumCerebral AngiographyVasospasm, IntracranialSerotoninNG-Nitroarginine Methyl EsterRats, Sprague-DawleyEnzyme InhibitorsTime FactorsIndomethacinNorepinephrineBungarotoxinsBradykinin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidArginineAortaGuinea PigsCyclic GMPTorpedoRats, WistarPapaverineMammary ArteriesElectric StimulationCells, CulturedIliac ArteryCarotid Artery, InternalAtropineCharybdotoxinReceptors, MuscarinicVasomotor SystemIntracranial AneurysmMuscle TonusSwinePhenylephrineMembrane PotentialsOxadiazolesCoronary Artery BypassRadial ArteryVesicular Acetylcholine Transport ProteinsNitric Oxide Synthase Type IIICarbacholNicotinic AntagonistsCerebrovascular CirculationNitric Oxide DonorsMethylene BlueRats, Inbred WKYNicotinePotassiumomega-N-MethylarginineMesenteric Artery, SuperiorArterial Occlusive DiseasesKineticsBlood PressureMiddle Cerebral ArteryMagnetic Resonance AngiographyMagnetic Resonance SpectroscopyHistamineCarotid Artery Diseases