Mesenteric ArteriesMesenteric Artery, SuperiorIntestine, SmallMesenteric Artery, InferiorIntestinesArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryIntestine, LargePulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularSplanchnic CirculationCarotid ArteriesVasoconstrictionFemoral ArteryDuodenal NeoplasmsBasilar ArteryMesenteric VeinsIntestinal MucosaJejunumBiological FactorsVasoconstrictor AgentsVasodilator AgentsRats, WistarIliac ArterySplenic ArteryEndothelium, VascularNorepinephrineRats, Sprague-DawleyDuodenostomyDuodenal DiseasesCoronary Artery BypassVertebral ArteryIleumHepatic ArteryPhenylephrineMuscle ContractionDuodenal ObstructionAcetylcholineRadial ArteryMyographyMuscle RelaxationMammary ArteriesDose-Response Relationship, DrugTime FactorsTomography, X-Ray ComputedCarotid Artery, InternalIntestinal AbsorptionSubclavian ArteryAngiographyRats, Inbred WKYNitric OxideDogsCarotid Artery DiseasesCoronary VesselsBlood PressureRabbitsBrachial ArterySuperior ColliculiStomachTreatment OutcomeVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonSwineRegional Blood FlowAneurysmRats, Inbred SHRRenal Artery ObstructionPotassium ChlorideOphthalmic ArteryNG-Nitroarginine Methyl EsterCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidIndomethacinStentsArterial Occlusive DiseasesDigestive SystemGastrointestinal MotilityConstriction, PathologicBrunner GlandsCalciumMiddle Cerebral ArteryEnzyme InhibitorsUmbilical ArteriesThoracic ArteriesDuodenumMembrane PotentialsNitric Oxide SynthaseApaminColonUltrasonography, DopplerMesenteryDisease Models, AnimalTemporal ArteriesElectric Stimulation