Basilar ArteryEndothelium, VascularMuscle RelaxationVasodilationAcetylcholineVasodilator AgentsArteriesNitroglycerinNitroprussideNitric OxideVasoconstrictionVasoconstrictor AgentsEndotheliumMuscle, Smooth, VascularVertebrobasilar InsufficiencyBrachial ArteryRegional Blood FlowDose-Response Relationship, DrugNitric Oxide SynthaseCerebral ArteriesVertebral ArteryMesenteric ArteriesReceptors, NicotinicPulmonary ArteryReceptors, CholinergicCarotid ArteriesMuscle Contractionalpha7 Nicotinic Acetylcholine ReceptorSubarachnoid HemorrhageBrain Stem InfarctionsEndothelium, CornealRenal ArteryFemoral ArteryRabbitsCerebral AngiographyDogsVasospasm, IntracranialPotassium ChlorideCoronary VesselsNitroarginineSerotoninBungarotoxinsCalciumTorpedoRats, Sprague-DawleyAorta, ThoracicBiological FactorsTime FactorsCarotid Artery, InternalIliac ArteryEnzyme InhibitorsMammary ArteriesCells, CulturedIntracranial AneurysmNorepinephrineRelaxationReceptors, MuscarinicRelaxation TherapyNG-Nitroarginine Methyl EsterPapaverineMuscle, SmoothVesicular Acetylcholine Transport ProteinsCoronary Artery BypassIndomethacinRadial ArteryBradykininVasomotor SystemNicotinic AntagonistsCerebrovascular CirculationGuinea PigsAtropineAorta15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidRats, WistarArginineArterial Occlusive DiseasesNicotineMembrane PotentialsMagnetic Resonance AngiographyCarotid Artery DiseasesCarbacholMiddle Cerebral ArteryElectric StimulationNicotinic AgonistsCyclic GMPSwineSubclavian ArteryMesenteric Artery, SuperiorNitric Oxide Synthase Type IIICharybdotoxinMuscle TonusRats, Inbred WKYPicolinesPotassiumPhenylephrineTomography, X-Ray ComputedBlood PressureSumatriptanHepatic Arteryomega-N-Methylarginine