Mesenteric ArteriesMesenteric Artery, SuperiorMesenteric Artery, InferiorArteriesMesenteric Vascular OcclusionCeliac ArterySuperior Mesenteric Artery SyndromePulmonary ArteryRenal ArteryCerebral ArteriesVasodilationMuscle, Smooth, VascularCarotid ArteriesVasoconstrictionFemoral ArterySplanchnic CirculationBasilar ArteryMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularNorepinephrineVertebral ArteryCoronary Artery BypassHepatic ArteryPhenylephrineMyographyRadial ArteryMammary ArteriesRats, WistarAcetylcholineCarotid Artery, InternalDuodenostomySubclavian ArteryRats, Inbred WKYRats, Sprague-DawleyMuscle RelaxationMuscle ContractionAngiographyTomography, X-Ray ComputedCarotid Artery DiseasesCoronary VesselsNitric OxideDose-Response Relationship, DrugBrachial ArteryBlood PressureSuperior ColliculiVena Cava, SuperiorEndothelium-Dependent Relaxing FactorsCarotid Artery, CommonAneurysmTime FactorsTreatment OutcomeRats, Inbred SHRRenal Artery ObstructionOphthalmic ArteryRegional Blood FlowPotassium ChlorideCharybdotoxin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidNG-Nitroarginine Methyl EsterArterial Occlusive DiseasesDogsStentsConstriction, PathologicMiddle Cerebral ArteryUmbilical ArteriesThoracic ArteriesRabbitsUltrasonography, DopplerTemporal ArteriesIndomethacinBronchial ArteriesAortaPopliteal ArteryNitroprussideHypertensionAorta, ThoracicEnzyme InhibitorsNitric Oxide SynthaseVasomotor SystemUlnar ArteryApaminVascular ResistancePrazosinMembrane PotentialsNitroarginineUterine ArteryBlood Vessel Prosthesis ImplantationAorta, AbdominalCalciumCoronary AngiographyDesoxycorticosteroneCarotid Artery, ExternalNitric Oxide Synthase Type IIIElectric StimulationPotassium Channel Blockers