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Abstract
The chloride and bicarbonate movement in ileum and jejunum has been studied. The chloride transport is closely related with the intraluminal concentration, and it is absorbed from levels lower than plasmatic ones in terminal ileum and proximal jejunum, but the absorption process is stronger in terminal ileum. Simultaneously the bicarbonate ion is excreted until levels higher than the plasmatic ones and the excretion decreases when the intraluminal concentration increases, this occurs also in jejunal segment, although the bicarbonate excretion in this segment only takes place until concentrations lightly greater than the plasmatic levels. A reciprocal relationship was found between the chloride and bicarbonate movements, more obvious in ileum than in jejunum.
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