Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionSuperior Mesenteric Artery SyndromeCeliac ArteryPulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionFemoral ArterySplanchnic CirculationBasilar ArteryDuodenal NeoplasmsMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularNorepinephrineRats, WistarDuodenostomyCoronary Artery BypassVertebral ArteryHepatic ArteryDuodenal DiseasesPhenylephrineDuodenal ObstructionRats, Sprague-DawleyRadial ArteryAcetylcholineMyographyMuscle ContractionMuscle RelaxationMammary ArteriesTomography, X-Ray ComputedCarotid Artery, InternalDose-Response Relationship, DrugSubclavian ArteryTime FactorsAngiographyRats, Inbred WKYIntestine, SmallCarotid Artery DiseasesCoronary VesselsNitric OxideBlood PressureBrachial ArterySuperior ColliculiDogsTreatment OutcomeVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonJejunumAneurysmRabbitsIntestinesRats, Inbred SHRRegional Blood FlowRenal Artery ObstructionOphthalmic ArteryPotassium ChlorideCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNG-Nitroarginine Methyl EsterStentsArterial Occlusive DiseasesConstriction, PathologicMiddle Cerebral ArteryIndomethacinUmbilical ArteriesIntestinal MucosaBrunner GlandsStomachThoracic ArteriesEnzyme InhibitorsCalciumUltrasonography, DopplerTemporal ArteriesNitric Oxide SynthaseAortaBronchial ArteriesApaminMembrane PotentialsAorta, ThoracicHypertensionNitroarginineElectric StimulationPopliteal ArteryNitroprussideIleumPrazosinUlnar Artery