Action PotentialsNeuronsNeurons, AfferentMotor NeuronsElectrophysiologyPatch-Clamp TechniquesMembrane PotentialsElectric StimulationTetrodotoxinAxonsCalciumSynaptic TransmissionDendritesSynapsesSodium ChannelsPyramidal CellsPotassium ChannelsGuinea PigsNeural ConductionHippocampusPotassiumExcitatory Postsynaptic PotentialsMicroelectrodesModels, NeurologicalElectric ConductivityVentricular FunctionTime FactorsGanglia, SpinalCells, CulturedHeartNeural Inhibition4-AminopyridineSensory Receptor Cellsgamma-Aminobutyric AcidHeart Conduction SystemAnimals, NewbornInterneuronsEvoked PotentialsRats, WistarGABAergic NeuronsSodiumPotassium Channel BlockersDopaminergic NeuronsSodium Channel BlockersPapillary MusclesSpinal CordCatsRats, Sprague-DawleyTetraethylammonium CompoundsIon ChannelsCerebral CortexHeart VentriclesCalcium ChannelsTetraethylammoniumPotassium Channels, Voltage-GatedPurkinje FibersNerve Tissue ProteinsElectrophysiological PhenomenaNeocortexOlfactory Receptor NeuronsPresynaptic TerminalsReaction TimeRefractory Period, ElectrophysiologicalNeurotransmitter AgentsIon Channel GatingNeurons, EfferentCalcium SignalingGangliaCholinergic NeuronsAnti-Arrhythmia AgentsMyocytes, CardiacModels, CardiovascularDelayed Rectifier Potassium ChannelsBrain StemNeuronal PlasticityAfferent PathwaysGlutamic AcidArrhythmias, CardiacCalcium Channel BlockersCalcium Channels, L-TypeDogsNerve NetMotor Neuron DiseaseExcitatory Amino Acid AntagonistsImmunohistochemistryGanglia, InvertebrateDopamineGABA AntagonistsNeuropeptidesNodose GanglionMedulla OblongataPhysical StimulationBicucullineAplysiaDose-Response Relationship, DrugGanglia, SympatheticNociceptorsVoltage-Sensitive Dye ImagingPeriodicityMyocardium