Mesenteric ArteriesIntestine, SmallMesenteric Artery, SuperiorMesenteric Artery, InferiorIntestinesArteriesMesenteric Vascular OcclusionIntestine, LargeCeliac ArterySuperior Mesenteric Artery SyndromeJejunumIntestinal MucosaPulmonary ArteryRenal ArterySplanchnic CirculationCerebral ArteriesVasodilationMuscle, Smooth, VascularVasoconstrictionCarotid ArteriesFemoral ArteryIleumIntestinal AbsorptionMesenteric VeinsBasilar ArteryBiological FactorsRats, WistarVasoconstrictor AgentsVasodilator AgentsDuodenumIliac ArterySplenic ArteryRats, Sprague-DawleyEndothelium, VascularNorepinephrineVertebral ArteryCoronary Artery BypassHepatic ArteryAcetylcholinePhenylephrineMyographyRadial ArteryDose-Response Relationship, DrugTime FactorsMuscle ContractionMammary ArteriesCarotid Artery, InternalDuodenostomySubclavian ArteryIntestinal NeoplasmsIntestinal DiseasesTomography, X-Ray ComputedMuscle RelaxationNitric OxideSwineRats, Inbred WKYMicrovilliAngiographyRabbitsCarotid Artery DiseasesColonBlood PressureCoronary VesselsDogsBrachial ArterySuperior ColliculiDigestive SystemVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonTreatment OutcomeMesenteryRegional Blood FlowAneurysmEnterocytesRats, Inbred SHRPotassium ChlorideRenal Artery ObstructionNG-Nitroarginine Methyl EsterIndomethacinOphthalmic ArteryCharybdotoxinRNA, Messenger15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidEnzyme InhibitorsConstriction, PathologicMice, Inbred C57BLReperfusion InjuryArterial Occlusive DiseasesGuinea PigsGastrointestinal MotilityDisease Models, AnimalMembrane PotentialsRats, Inbred StrainsCalciumStentsMiddle Cerebral ArteryUmbilical ArteriesStomachApamin