Intestinal Absorption of Sodium Chloride Solutions as Influenced by Intraluminal Pressure and Concentration

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Abstract
The absorption of NaCl solns. was studied in 3 dogs with upper jejunal fistulas of the Omi type. The absorption periods lasted 30 min. and measurements were made of net water and Cl absorption. During the expts. the intraluminal hydrostatic pressure of the test solns. was maintained at a given level by the use of a burette-catheter system. The dogs were generally used in the unanesthetized state. There were significant differences in the mean rates of absorption of Cl and water at different levels of hydrostatic pressure. Absorption was most rapid at an optimal pressure. Water was absorbed more rapidly from dilute solns. than from concn. solns. Cl was absorbed from the 5 solns. of different concn. at the same rate.

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