[The potassium ion yield from the frog muscle studied using a contact ion-selective electrode].
With the aid of a contact K(+)-sensitive electrode, potassium levels were measured near the surface of the frog resting and twitching isolated m. gastrocnemius. Increasing extracellular K+ in case of indirect repetitive stimulation of the muscle or the blocking of K(+)-Na(+) pump can lead to a depression of the muscle twitches. Transition from repetitive to single-shock stimulation of the muscle restored the twitches. Elevated extracellular potassium seems to be able to cause a presynaptic blockade in the motor axons.
Kubasov
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D000818:Animals; D004558:Electric Stimulation; D004566:Electrodes; D066298:In Vitro Techniques; D007477:Ions; D008564:Membrane Potentials / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D009469:Neuromuscular Junction / Q000502:physiology; D011188:Potassium / Q000032:analysis / Q000502:physiology*; D011896:Rana temporaria
D007477:Ions; D011188:Potassium
Issledovanie vykhoda ionov kaliia iz myshtsy liagushki pri pomoshchi kontaktnogo ion-selektivnogo élektroda.