title: Effects of potassium ions on the impulse activity of the ampullae of Lorenzini of the skate.
abstract: Perfusion of the basal membrane of the ampullae of Lorenzini with high potassium solution caused a substantial increase in the resting firing rate. This effect was not accompanied by any change in the threshold of the afferent fibres. The low potassium solution caused a decrease in the resting firing rate. When synaptic transmission was abolished by high Mg2+ solution, succeeding perfusion with 10 mM K+ did not induce responses in the afferent fibres. The role of potassium ions in the activity of the ampullae of Lorenzini is discussed.
mesh_terms: D000818:Animals; D004553:Electric Conductivity / Q000187:drug effects; D005399:Fishes; D007700:Kinetics; D011188:Potassium / Q000494:pharmacology*; D011984:Sensory Receptor Cells / Q000187:drug effects / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D011188:Potassium