IleumGuinea PigsMyenteric PlexusMuscle, SmoothReceptors, Adrenergic, beta-2Diphenylacetic AcidsMuscle ContractionReceptors, AdrenergicReceptors, Adrenergic, beta-1Submucous PlexusParasympatholyticsPeristalsisAtropineReceptors, Adrenergic, alphaReceptors, Adrenergic, alpha-2SRS-ACaulerpaHistamine AntagonistsReceptors, Adrenergic, alpha-1Receptors, OpioidVas DeferensAcetylcholineReceptors, Adrenergic, betaReceptors, Adrenergic, beta-3TachykininsAutacoidsReceptors, Neurokinin-3Electric StimulationHexamethoniumMuscarinic AgonistsOxotremorineReceptors, Serotonin, 5-HT4XylopiaSteviaAdrenergic beta-2 Receptor AntagonistsMorphinansPyrilamineReceptors, MuscarinicAdrenergic beta-2 Receptor AgonistsEndorphinsEnteric Nervous SystemDose-Response Relationship, DrugAdrenergic alpha-AgonistsAdrenergic beta-AgonistsPrazosinMorphineMuscarinic AntagonistsGastrointestinal MotilityReceptor, Muscarinic M2Substance PRadioligand AssayAdrenergic alpha-AntagonistsToxins, BiologicalCarbacholReceptors, Neurokinin-1NaloxoneAnaphylatoxinsHistamineAdrenergic alpha-1 Receptor AntagonistsIsoproterenolReceptor, Muscarinic M3EtorphinePiperidinesYohimbineBinding, CompetitiveTetrodotoxinAdrenergic AgonistsAdrenergic AntagonistsPropanolaminesGuineaEnkephalin, MethionineSerotoninBiological AssayPirenzepineNarcotic AntagonistsAdrenergic beta-3 Receptor AgonistsIntestinal MucosaPapaverineNorepinephrineAdrenergic beta-1 Receptor AgonistsReceptors, Opioid, muCalciumSerotonin AntagonistsIodocyanopindololAdrenergic alpha-1 Receptor AgonistsDihydroalprenololRabbitsEpinephrinePapua New GuineaAdrenergic alpha-2 Receptor AgonistsClonidineReceptors, Opioid, deltaOpioid PeptidesAdrenergic alpha-2 Receptor AntagonistsPindololAdrenergic beta-AntagonistsSwineAdrenergic beta-1 Receptor AntagonistsAnalgesics, OpioidEnkephalins