Basilar ArteryEndothelium, VascularMuscle RelaxationVasodilationVasodilator AgentsArteriesAcetylcholineNitroglycerinNitroprussideNitric OxideVasoconstrictionVertebrobasilar InsufficiencyEndotheliumVasoconstrictor AgentsMuscle, Smooth, VascularBrachial ArteryRegional Blood FlowNitric Oxide SynthaseDose-Response Relationship, DrugCerebral ArteriesVertebral ArteryCyclic GMPPulmonary ArteryMesenteric ArteriesCarotid ArteriesSubarachnoid HemorrhageBrain Stem InfarctionsEndothelium, CornealRenal ArteryFemoral ArteryMuscle ContractionCerebral AngiographyVasospasm, IntracranialRabbitsDogsCoronary VesselsNitroargininePotassium ChlorideGuanylate CyclaseCarotid Artery, InternalSerotoninIliac ArteryEnzyme InhibitorsIntracranial AneurysmMammary ArteriesRelaxationAorta, ThoracicRelaxation TherapyCalciumCoronary Artery BypassRats, Sprague-DawleyTime FactorsRadial ArteryCells, CulturedNG-Nitroarginine Methyl EsterCyclic GMP-Dependent Protein KinasesNitric Oxide DonorsBiological FactorsOxadiazolesCerebrovascular CirculationArterial Occlusive DiseasesPapaverineAortaMagnetic Resonance AngiographyCarotid Artery Diseases15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMiddle Cerebral ArteryArginineIndomethacinSubclavian ArteryBradykininVasomotor SystemSwineNorepinephrineRats, WistarNitric Oxide Synthase Type IIIMesenteric Artery, Superior3',5'-Cyclic-GMP PhosphodiesterasesTomography, X-Ray ComputedMuscle, SmoothSumatriptanSplenic ArteryPicolinesHepatic ArteryCarotid Artery, CommonRats, Inbred WKYCircle of WillisMethylene BlueCharybdotoxinMuscle TonusEndothelial CellsSignal TransductionDisease Models, AnimalBlood PressureOphthalmic ArteryTreatment OutcomeQuinoxalinesAngiography, Digital SubtractionCyclic Nucleotide Phosphodiesterases, Type 5Celiac Artery