[Post-tetanic hyperpolarization of lake-frog isolated nerve fibers].
Posttetanic hyperpolarization (PTH) parameters of a single node of Ranvier remained unchanged with increase of the stimulation duration of over 0.1 sec. PTH was insensitive to strophanthin, but was eliminated by tetraethylammonium. Resistance of the membrane of node of Ranvier measured by the amplitude of anode impacts proved to be lovered during the PTH by 50%. A conclusion was drawn that PTH of the isolated nerve fibers was caused by the persistence of increased potassium permeability during and after the end of tetanus. An increase in duration of tetanization failed to lead to the appearance of PTH associated with active ion transport.
D000818:Animals; D001001:Anura; D003864:Depression, Chemical; D004558:Electric Stimulation; D008564:Membrane Potentials / Q000187:drug effects; D010507:Periodicity; D011901:Ranvier's Nodes / Q000502:physiology*; D013328:Strophanthins / Q000494:pharmacology; D013757:Tetraethylammonium Compounds / Q000494:pharmacology; D013997:Time Factors
D013328:Strophanthins; D013757:Tetraethylammonium Compounds
Posttetanicheskaia giperpoliarizatsiia izolirovannogo nervnogo volikna ozernoĭ liagushki