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Abstract
We have studied the changes of bicarbonate and chloride in a loop "in situ" of terminal ileum of rabbit. We analysed the concentration of Cl-, C03H-, Na+ y K+ after half and hour that solutions have been remaining in the loop. There is a movement mucosa-serosa of chloride from a concentration initial of 58 mEq/l. In the case of bicarbonate takes place a movement
serosa-mucosa, even when the solution contains 67 mEq/l, higher level than in the plasma, this indicates in terminal ileum of rabbits that exist an active process of secretion of bicarbonate. We can confirm the existence of this mechanism in hypothermia. In these conditions the secretion of bicarbonate in almost nule for a solution containing a concentration of bicarbonate similar to the plasma.
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