Absorption of Glucose,Galactose,and Xylose in the Dog ∗

Summary

Jejunal fistulas of conscious dogs were perfused with mixtures containing NaCl, and a test sugar at concentrations up to ISO mM and an inhibitor sugar at concentrations between 0 and 75 mM. The absorption rates of glucose, galactose, and xylose increased with increasing bowel lumen concentrations of each sugar, and increased with increasing net rates of fluid absorption. Glucose reduced the absorption rates of galactose and of xylose, and galactose reduced glucose absorption. Xylose did not have a consistent effect on glucose absorption.