Mesenteric ArteriesJejunumMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesSplanchnic CirculationIntestine, SmallVasoconstrictionFemoral ArteryDuodenal NeoplasmsBasilar ArteryIleumMesenteric VeinsBiological FactorsVasoconstrictor AgentsRats, WistarIntestinal MucosaVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularDuodenostomyIntestinal AbsorptionRats, Sprague-DawleyDuodenal DiseasesNorepinephrineIntestinesCoronary Artery BypassMuscle ContractionVertebral ArteryHepatic ArteryPhenylephrineDuodenal ObstructionMuscle RelaxationAcetylcholineRadial ArteryMyographyJejunal DiseasesDose-Response Relationship, DrugMammary ArteriesTomography, X-Ray ComputedTime FactorsCarotid Artery, InternalSubclavian ArteryAngiographyDogsRats, Inbred WKYNitric OxideCarotid Artery DiseasesCoronary VesselsJejunal NeoplasmsBlood PressureBrachial ArteryTreatment OutcomeSuperior ColliculiRabbitsStomachVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonGastrointestinal MotilitySwineDuodenumAneurysmRegional Blood FlowRats, Inbred SHRRenal Artery ObstructionNG-Nitroarginine Methyl EsterOphthalmic ArteryIndomethacinPotassium ChlorideCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidIntestinal SecretionsStentsArterial Occlusive DiseasesConstriction, PathologicMiddle Cerebral ArteryEnzyme InhibitorsUmbilical ArteriesApaminCalciumMembrane PotentialsBrunner GlandsNitric Oxide SynthaseJejunostomyThoracic ArteriesElectric StimulationUltrasonography, DopplerNitroarginineTemporal Arteries