Figure 2. K⁺ loading increases luminal iberiotoxin-sensitive K⁺ secretion.

Luminal iberiotoxin (IBTX) slowly changed the transepithelial voltage (V_te) to more lumen-negative values. A is a summary of 6 experiments. B displays the corresponding changes of short-circuit current calculated 20 min after addition of IBTX. Note that the high K⁺ diet augmented the IBTX-sensitive short-circuit current.