[Electrical characteristics of the epithelial tissue and cells of the carp and frog gallbladder].
Transepithelial potential and resistance, the ratio of resistance of the apical to the basal cell membranes (Ra/Rb) were studied during transmural current clamps in isolated frog and fish gall-bladder (GB) with Ringer's solution on both sides. The findings show that: 1) the difference between the mucosal and serosal membrane potentials (MPs) was 3-8 mV as determined by transmural potential; 2) the ratio Ra/Rb depends on the MP value: it was less than 1 if MP was about 30 mV, and more than 1 if MP was over 30 mV; 3) outward and inward current clamps (about 20 microA/0.3 cm2) produced linear changes of MP on both apical and basal membranes; at high currents (40-60 microA/0.3 cm2) linear dependence is distorted especially for apical membrane whose conductance abruptly increases during current clamps.
D000818:Animals; D002347:Carps / Q000502:physiology*; D003530:Cyprinidae / Q000502:physiology*; D005704:Gallbladder / Q000502:physiology*; D066298:In Vitro Techniques; D008564:Membrane Potentials; D011895:Rana ridibunda / Q000502:physiology*; D011898:Ranidae / Q000502:physiology*
Elektricheskie kharakteristiki épitelial'noĭ tkani i kletok zhelchnogo puzyria karpa i liagushki.