AcetylcholinePharmacologyPharmacology, ClinicalReceptors, NicotinicReceptors, Cholinergicalpha7 Nicotinic Acetylcholine ReceptorBungarotoxinsTorpedoNicotinic AntagonistsVesicular Acetylcholine Transport ProteinsReceptors, MuscarinicNicotinic AgonistsNicotineAtropineElectric OrganPhysostigmineTubocurarineCholinergic AgentsNeuromuscular JunctionCarbacholDose-Response Relationship, DrugMuscarinic AntagonistsCholinesterase InhibitorsCholineAcetylcholinesteraseMuscarinic AgonistsReceptor, Muscarinic M1ParasympathomimeticsVasodilationReceptor, Muscarinic M2MecamylamineVasodilator AgentsReceptor, Muscarinic M3Myasthenia GravisMusclesConotoxinsGuinea PigsMotor EndplateAzocinesCholine O-AcetyltransferaseNitroprussideMembrane PotentialsCholinergic AgonistsParasympatholyticsAconitineBicyclo Compounds, HeterocyclicMuscle ContractionElectric StimulationEndothelium, VascularNeuronsHexamethonium CompoundsSynaptic TransmissionQuinolizinesOxotremorineRats, Sprague-DawleyCobra Neurotoxin ProteinsCalciumNeostigmineParasympathetic Nervous SystemMuscle, SmoothQuinuclidinyl BenzilateRadioligand AssayIontophoresisGallamine TriethiodideAgrinElectrophysiologyCholinergic FibersLigandsN-MethylscopolamineHemicholinium 3Xenopus laevisDihydro-beta-ErythroidineCholinergic AntagonistsNorepinephrineMuscle DenervationDimethylphenylpiperazinium IodideNitric OxideScopolamine HydrobromideIon ChannelsPiperidinesPatch-Clamp TechniquesPirenzepineKineticsElectrophorusBinding, CompetitiveReceptor, Muscarinic M4PyridinesIleumDecamethonium CompoundsTime FactorsAmphibian VenomsNeurotransmitter AgentsProtein SubunitsMuscarineOocytesSynaptic MembranesMuscle RelaxationRats, WistarPotassiumAmino Acid Sequence