Sodium, potassium and chloride intracellular concentrations in the intestine of the freshwater turtle Mauremys caspica.
Sodium, potassium and chloride intracellular concentrations were measured. Sodium replacement from the bathing medium induced a significant decrease in chloride intracellular concentration. Conversely, chloride replacement from the bathing medium induced a significant decrease in sodium intracellular concentration. These results suggest the existence of a coupled NaCl transport system. The presence of 10(-3) M ouabain in the bathing medium increased Na+ intracellular concentration while decreasing that of K+. Cyanide (10(-3) M) produced a significant increase in Na+ intracellular concentration, whereas that of K+ was not affected by this agent.
D000818:Animals; D001693:Biological Transport, Active / Q000187:drug effects; D002712:Chlorides / Q000378:metabolism*; D003486:Cyanides / Q000494:pharmacology; D066298:In Vitro Techniques; D007408:Intestinal Absorption / Q000187:drug effects; D007413:Intestinal Mucosa / Q000378:metabolism*; D007424:Intracellular Fluid / Q000032:analysis; D010042:Ouabain / Q000494:pharmacology; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*; D014426:Turtles / Q000378:metabolism*
D002712:Chlorides; D003486:Cyanides; D010042:Ouabain; D012964:Sodium; D011188:Potassium