TetrodotoxinMembrane PotentialsSodium Channel BlockersAction PotentialsNerve BlockElectrophysiologyElectric ConductivitySaxitoxinPatch-Clamp TechniquesSodiumIon Channel GatingIon ChannelsPotassiumElectric StimulationCalciumHeart BlockSodium ChannelsVeratridinePotassium ChannelsGuinea PigsNeuronsTetraethylammonium CompoundsAtropineMuscle ContractionKineticsAnesthetics, LocalBariumTetraethylammoniumMuscle, SmoothCalcium ChannelsDecapodiformesOocytesCesiumTetraodontiformesCalcium Channel Blockers