these results can be explained by postulating a single defect in the double ion exchange model ( sodium-hydrogen , chloride-bicarbonate ) previously proposed for normal ileal transport : i.e. , normal sodium-hydrogen exchange , but a chloride-bicarbonate exchange that is incapable of transporting chloride against an electrochemical gradient , yet continues to transport anions passively .
C0008203
chloride
C0003075
anions