Sodium and potassium movements in the isolated preparation of guinea-pig's taenia coli soaked in high KCl Krebs solution and LiCl Krebs solution were estimated. In high KCl Krebs solution, both inward and outward movements of 42K were increased in proportion to the degree of depolarization . In LiCl solution 42K uptake was reduced though 24Na uptake was not influenced , 42K efflux increased and...