title: [Intracellular activity of potassium in frog spinal cord motor neurons].
abstract: Intracellular K activity (aik) in frog motoneurons of isolated spinal cord as measured by double-barrelled K+-selective microelectrodes revealed mean values as follows: 74.8 +/- 2.5 mM at the beginning of the recording and 51.6 +/- 2.9 mM afterwards (mean +/- SE). The average value of the resting potential of motoneurons (Em) was 54.1 +/- 1.2 mV. The difference between Ek (potassium equilibrium potential) and Em was 25.0 +/- 0.98 mV. Stimulation of ventral roots of spina-cord decreased aik both in normal and in Ca2+-free Ringer solution. No changes of aik occurred in synaptic stimulation without spike potentials.
mesh_terms: D000818:Animals; D008564:Membrane Potentials; D009046:Motor Neurons / Q000032:analysis* / Q000502:physiology; D011188:Potassium / Q000032:analysis*; D011895:Rana ridibunda; D013116:Spinal Cord / Q000032:analysis* / Q000502:physiology; D013126:Spinal Nerve Roots / Q000502:physiology; D013569:Synapses / Q000502:physiology
chemical_list: D011188:Potassium
vernacular_title: Vnutrikletochnaia aktivnost' kaliia v motoneĭronakh spinnogo mozga liagushki.