Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionFemoral ArterySplanchnic CirculationBasilar ArteryDuodenal NeoplasmsMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularRats, WistarNorepinephrineDuodenostomyCoronary Artery BypassVertebral ArteryHepatic ArteryDuodenal DiseasesPhenylephrineDuodenal ObstructionRats, Sprague-DawleyMuscle ContractionAcetylcholineRadial ArteryMyographyMuscle RelaxationMammary ArteriesTomography, X-Ray ComputedCarotid Artery, InternalDose-Response Relationship, DrugTime FactorsSubclavian ArteryAngiographyIntestine, SmallRats, Inbred WKYCarotid Artery DiseasesCoronary VesselsNitric OxideBlood PressureDogsSuperior ColliculiBrachial ArteryTreatment OutcomeVena Cava, SuperiorRabbitsEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonJejunumAneurysmIntestinesRats, Inbred SHRRegional Blood FlowRenal Artery ObstructionOphthalmic ArteryPotassium ChlorideCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidStentsArterial Occlusive DiseasesNG-Nitroarginine Methyl EsterConstriction, PathologicMiddle Cerebral ArteryIntestinal MucosaIndomethacinBrunner GlandsStomachUmbilical ArteriesCalciumThoracic ArteriesUltrasonography, DopplerEnzyme InhibitorsTemporal ArteriesNitric Oxide SynthaseAortaMembrane PotentialsElectric StimulationAorta, ThoracicBronchial ArteriesApaminIleumHypertensionSwineNitroprussideNitroargininePopliteal ArteryUlnar Artery