. Kirkes' handbook of physiology . loss. Analysis of the total lymph discharge of the thoracicduct fails to show any increase of proteids during active digestion, from whichit is inferred that proteids pass by way of the liver. ABSORPTION OF CARBOHYDRATES BY THE INTESTINES 367 From 12 to 15 per cent of the proteid remains in the food as it passes theileocecal valve. This amount, less the loss in the feces, is absorbed in thelarge intestine. Absorption of Carbohydrates by the Intestines. Carbohydratesare broken down to dextrose, levulose, etc., and are absorbed as such. Eventhe soluble cane-sug
. Kirkes' handbook of physiology . loss. Analysis of the total lymph discharge of the thoracicduct fails to show any increase of proteids during active digestion, from whichit is inferred that proteids pass by way of the liver. ABSORPTION OF CARBOHYDRATES BY THE INTESTINES 367 From 12 to 15 per cent of the proteid remains in the food as it passes theileocecal valve. This amount, less the loss in the feces, is absorbed in thelarge intestine. Absorption of Carbohydrates by the Intestines. Carbohydratesare broken down to dextrose, levulose, etc., and are absorbed as such. Eventhe soluble cane-sugar is split by the invertase of the intestine into the mono-saccharides, dextrose and levulose. Starch is the source of most of the 500grams of dextrose absorbed in an average diet per day. During the absorp-tion of a carbohydrate meal the percentage of dextrose in the blood of theportal vein is increased over the normal which is to per cent. Thisexcess of dextrose passes through the liver and is temporarily stored in the. Fig. 284.—Section of the Villus of a Rat Killed during Fat Absorption, ep. Epithelium; :tr, stri-ated Vxjrder; c, lymph-cells; c, lymph-cells in the epithelium; /, central lacteal containing disinte-grating lymph-corpuscles. (E. A. Schafer.) liver cells as glycogen. In the case of a fistula in the receptaculum chyli,the chyle contained less than a half per cent of the total dextrose absorbed. Experiments on the rate of absorption of the different sugars seem toindicate that their absorption does not follow known physical laws and thatwe must assume an unknown chemical factor in the living protoplasm. Dextroses are absorbed readily by the large intestine. Fermentation process from bacterial growth produces certain acids fromthe carbohydrates, chiefly in the large intestine. These are readily absorbed. Absorption of Fats by the Intestines. Fats reach the absorbingepithelium in two forms, as soluble glycerin and soaps and as finely emulsi-fied fats. Th
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