Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionFemoral ArteryUreteral DiseasesSplanchnic CirculationBasilar ArteryDuodenal NeoplasmsMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryMuscle ContractionEndothelium, VascularRats, WistarNorepinephrineHydronephrosisUreteroscopyUreteral ObstructionDuodenostomyCoronary Artery BypassVertebral ArteryHepatic ArteryTomography, X-Ray ComputedDuodenal DiseasesRats, Sprague-DawleyPhenylephrineMuscle RelaxationDuodenal ObstructionRadial ArteryMyographyAcetylcholineMammary ArteriesDose-Response Relationship, DrugTime FactorsUrographyCarotid Artery, InternalUreteral CalculiSubclavian ArteryTreatment OutcomeAngiographyRats, Inbred WKYUrinary TractIntestine, SmallDogsCarotid Artery DiseasesCoronary VesselsNitric OxideBlood PressureBrachial ArterySuperior ColliculiVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonRabbitsJejunumStentsMuscle, SmoothAneurysmPotassium ChlorideIntestinesRats, Inbred SHRConstriction, PathologicRegional Blood FlowRenal Artery ObstructionOphthalmic ArteryGuinea PigsIndomethacinCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidKidneyNG-Nitroarginine Methyl EsterArterial Occlusive DiseasesRetrocaval UreterSwineMembrane PotentialsIleumMiddle Cerebral ArteryCalciumNitroarginineUmbilical ArteriesVesico-Ureteral RefluxElectric StimulationIntestinal MucosaBrunner GlandsEnzyme InhibitorsStomach