PhenoxybenzamineAdrenergic alpha-AntagonistsDibenzylchlorethamineTolazolineReceptors, AdrenergicNorepinephrinePhentolamineSympatholyticsReceptors, Adrenergic, alphaNormetanephrinePropranololCystaminePrazosinEpinephrineReserpineGuanethidineErgotamineBretylium CompoundsPharmacologyYohimbineSympathomimeticsAdrenergic alpha-AgonistsVas DeferensDesipramineNictitating MembraneElectric StimulationIsoproterenolHexamethonium CompoundsMethyltyrosinesCatsCatecholaminesHydroxydopaminesChloraloseMetaraminolTyramineAtropineMuscle, SmoothCycloparaffinsMuscle ContractionPhenylephrineCocaineUrethral ObstructionAmino AlcoholsSympathetic Nervous SystemDiphenylacetic AcidsGuinea PigsAdrenergic beta-AntagonistsEthylaminesClonidineIleumMethysergideDogsLysergic Acid DiethylamideNerve EndingsChlorisondamineDihydroergotoxineSpasmGanglia, AutonomicRabbitsPerfusionCyproheptadineScopolamine HydrobromidePargylineHistamine H1 AntagonistsStimulation, Chemical