With the isolated jejunal loop method, the quantitative conditions and dynamics of the portal transport of absorbed glucose were examined. The following findings are discussed: Considerable differences exist among the individual animals as to the rate of portal transport of glucose. This variation seems to be determined by the metabolic conditions of the small intestine. It was shown that a considerable quantity of glucose is already transported in the first 3 min. After the sugar solution has been washed out, hardly any sugar transport can be demonstrated, even as early as the first 5-min. period. In certain cases a large amount of glucose was transported, exceeding the quantity of sugar absorbed.
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