TetrodotoxinSaxitoxinSodium Channel BlockersSodium ChannelsVeratridineAction PotentialsElectric StimulationMembrane PotentialsAtropineSodiumGuinea PigsMuscle ContractionTetraodontiformesMuscle, SmoothRats, Sprague-DawleyNeuronsElectrophysiologyPotassiumAnesthetics, LocalCalciumVeratrineSynaptic TransmissionFishes, PoisonousProtoveratrinesNeuromuscular BlockadeGuanethidineDose-Response Relationship, DrugHexamethoniumIon ChannelsLidocaineHexamethonium CompoundsTetraethylammonium CompoundsPatch-Clamp TechniquesAcetylcholineCalcium Channel BlockersRats, WistarNorepinephrineIleumPropranololElectric ConductivityPoisonsProcaineTime FactorsPhentolamineExcitatory Amino Acid AntagonistsToxins, BiologicalNeuromuscular JunctionAxonsMuscle Relaxationgamma-Aminobutyric AcidAnuraNeurilemmaGABA AntagonistsNeurotransmitter AgentsBatrachotoxinsTubocurarineCells, CulturedMarine ToxinsSerotoninRana esculentaTetraethylammoniumGanglionic BlockersAconitineAdrenergic alpha-AntagonistsDecapodiformesSynapsesSerotonin AntagonistsColon6-Cyano-7-nitroquinoxaline-2,3-dioneNeurotoxinsDogsCesiumBicucullineGastrointestinal MotilityCnidarian VenomsNifedipineAnimals, NewbornMuscarinic AntagonistsScorpion VenomsMusclesConotoxinsNeuromuscular Blocking AgentsAdrenergic beta-AntagonistsMyenteric PlexusParasympathetic Nervous SystemHippocampusMethysergideNeuromuscular Depolarizing AgentsEvoked Potentials4-AminopyridineVagus NerveApaminPotassium ChannelsVasoactive Intestinal PeptideNerve EndingsSubstance P2-Amino-5-phosphonovalerateNeural InhibitionQuinoxalinesExcitatory Postsynaptic Potentials