Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMyelitis, TransverseMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryColon, TransversePulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionFemoral ArterySplanchnic CirculationBasilar ArteryDuodenal NeoplasmsMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsTransverse SinusesIliac ArterySplenic ArteryRats, WistarEndothelium, VascularNorepinephrineVertebral ArteryMuscle ContractionTomography, X-Ray ComputedDuodenostomyCoronary Artery BypassHepatic ArteryRats, Sprague-DawleyDuodenal DiseasesPhenylephrineDuodenal ObstructionMuscle RelaxationAcetylcholineRadial ArteryMyographyTime FactorsMammary ArteriesCarotid Artery, InternalDose-Response Relationship, DrugSubclavian ArteryAngiographyDogsRats, Inbred WKYIntestine, SmallTreatment OutcomeBlood PressureCoronary VesselsRabbitsCarotid Artery DiseasesNitric OxideBrachial ArterySuperior ColliculiVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonJejunumConstriction, PathologicIntestinesAneurysmRegional Blood FlowRats, Inbred SHRPotassium ChlorideRenal Artery ObstructionCalciumOphthalmic ArteryStentsCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidElectric StimulationNG-Nitroarginine Methyl EsterArterial Occlusive DiseasesAortaIntestinal MucosaMembrane PotentialsUmbilical ArteriesAorta, ThoracicStomachMiddle Cerebral ArteryUltrasonography, DopplerIndomethacinBrunner GlandsThoracic ArteriesEnzyme InhibitorsMagnetic Resonance ImagingTemporal ArteriesHypertensionIleumSwineNitric Oxide SynthaseDisease Models, AnimalBronchial Arteries