[The effect of changes in the pH of the external solution on the afterpotentials of individual frog nodes of Ranvier].
A decrease in pH to 5 elicited a small increase in afterdepolarization of a single Ranvier node and an increase in pH to 9 had no effect. Post-tetanic hyperpolarization decreases at pH 5 and its duration somewhat increases. An increase in pH to 9 also had no effect. Similar changes in afterdepolarization and post-tetanic hyperpolarization were observed in potassium free solutions. A conclusion is made that changes in afterpotentials are determined by changes in kinetics of the membrane potassium permeability.
D000200:Action Potentials; D000818:Animals; D002463:Cell Membrane Permeability; D006863:Hydrogen-Ion Concentration; D011188:Potassium / Q000378:metabolism; D011901:Ranvier's Nodes / Q000502:physiology*; D012964:Sodium / Q000378:metabolism
D012964:Sodium; D011188:Potassium
Vliianie izmeneniia pH vneshnego rastvora na sledovye potentsialy odinochnykh perekhvatov Ranv'e liagushki