Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesSplanchnic CirculationVasoconstrictionFemoral ArterySuperior ColliculiVena Cava, SuperiorMesenteric VeinsBasilar ArteryDuodenal NeoplasmsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularRats, WistarNorepinephrineDuodenostomyHepatic ArteryCoronary Artery BypassVertebral ArteryDuodenal DiseasesDuodenal ObstructionTomography, X-Ray ComputedPhenylephrineRats, Sprague-DawleyAcetylcholineRadial ArteryMyographyMuscle ContractionMammary ArteriesMuscle RelaxationTime FactorsCarotid Artery, InternalDose-Response Relationship, DrugSubclavian ArteryTreatment OutcomeAngiographySuperior Vena Cava SyndromeIntestine, SmallRats, Inbred WKYBlood PressureCarotid Artery DiseasesCoronary VesselsNitric OxideDogsBrachial ArteryCarotid Artery, CommonEndothelium-Dependent Relaxing FactorsJejunumAneurysmRabbitsIntestinesRegional Blood FlowRats, Inbred SHRSuperior Cervical GanglionRenal Artery ObstructionStentsOphthalmic ArteryPotassium ChlorideConstriction, PathologicCharybdotoxinArterial Occlusive Diseases15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNG-Nitroarginine Methyl EsterMiddle Cerebral ArteryIndomethacinIntestinal MucosaStomachUmbilical ArteriesUltrasonography, DopplerThoracic ArteriesBrunner GlandsElectric StimulationEnzyme InhibitorsCalciumTemporal ArteriesMembrane PotentialsNitric Oxide SynthaseAortaApaminHypertensionAorta, ThoracicPopliteal ArteryBronchial ArteriesNitroprussideIleumNitroarginine