Mesenteric ArteriesMesenteric Artery, SuperiorStomachMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryStomach NeoplasmsCerebral ArteriesMuscle, Smooth, VascularVasodilationCarotid ArteriesVasoconstrictionFemoral ArterySplanchnic CirculationDuodenal NeoplasmsBasilar ArteryMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsStomach DiseasesIliac ArterySplenic ArteryRats, WistarEndothelium, VascularNorepinephrineDuodenal DiseasesDuodenostomyHepatic ArteryCoronary Artery BypassVertebral ArteryMuscle ContractionRats, Sprague-DawleyDuodenal ObstructionPhenylephrineAcetylcholineMuscle RelaxationRadial ArteryMyographyTomography, X-Ray ComputedIntestine, SmallMammary ArteriesDose-Response Relationship, DrugTime FactorsCarotid Artery, InternalSubclavian ArteryGastric MucosaAngiographyRats, Inbred WKYNitric OxideDogsCarotid Artery DiseasesCoronary VesselsBlood PressureJejunumStomach UlcerTreatment OutcomeBrachial ArteryIntestinesSuperior ColliculiVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonRabbitsRegional Blood FlowAneurysmRats, Inbred SHRPyloric AntrumIntestinal MucosaRenal Artery ObstructionPotassium ChlorideIndomethacinGastrointestinal MotilityOphthalmic ArteryNG-Nitroarginine Methyl EsterCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidStentsArterial Occlusive DiseasesDigestive SystemConstriction, PathologicIleumMiddle Cerebral ArteryUmbilical ArteriesBrunner GlandsCalciumSwineThoracic ArteriesEnzyme InhibitorsElectric StimulationNitric Oxide SynthaseMembrane PotentialsUltrasonography, DopplerApaminTemporal ArteriesAorta