Figure 7.

Effects of changes in K⁺ concentrations on ramp I-V curves after 5-ms test pulses to +160 mV (A) or +140 mV (B). (A) Effects of changes in internal K⁺ concentration in one inside-out patch. Note that the outward currents at positive potentials are highest in absence of internal K⁺ and fall when low K⁺ concentrations are added to the internal solution. (B) Effects of changes in external K⁺ in one outside-out patch. Changes in outward currents are small relative to the changes in inward currents at negative potentials. See text for full discussion of these results. Data in A are from one inside-out patch, data in B are from one outside-out patch.