Human physiology . s of the mucous membrane; c, /, corre- 11 . oniil /- spending cells belonging to nerve plexus of villi; M, CCllS, ITCtnSUttCtllOn ui-rvi- til ires belonging to Meissners plexus, distributed orirl absorption We shall find direct evidence forthis theory when we examine the absorption of fats in detail. Not only from the great extension of the absorbing surface,but also from the various chemical digestive processes which thechyme undergoes in the small intestine (owing chiefly to theaction of the various enzymes of the secretions poured into it),absorption along the whole
Human physiology . s of the mucous membrane; c, /, corre- 11 . oniil /- spending cells belonging to nerve plexus of villi; M, CCllS, ITCtnSUttCtllOn ui-rvi- til ires belonging to Meissners plexus, distributed orirl absorption We shall find direct evidence forthis theory when we examine the absorption of fats in detail. Not only from the great extension of the absorbing surface,but also from the various chemical digestive processes which thechyme undergoes in the small intestine (owing chiefly to theaction of the various enzymes of the secretions poured into it),absorption along the whole of this tract is more active than in thestomach. Of this the case of duodenal fistula described by Buschgives plain evidence. Although the patient was abundantly fedby the mouth, she suffered continually from hunger, and in a fewweeks her weight went down so much that she was threatenedwith deathfrom marasmus, which was only averted on feeding herthrough the lower end of the fistula. In the cases of fistula at the. opposite and simill-^ . ,, tanCOUS functions iOr the v INTEENAL EESTITUTIVE SECEETIONS 269 end of the ileum described by Braun and Ewald, on the contrary,the body-weight was tolerably well maintained on an abundantdiet per os, notwithstanding the considerable loss of nutritivesubstances through the fistula. The maximal degree of absorption of the food-stuffs fromthe chyme is effected principally in the duodenum (below theorifices of Wirsungs duct and the common bile duct) and thejejunum. Euggis case of extensive resection of the ileum referredto in the last chapter (iv. § 5), in which the faeces did not containan abnormal excess of proteins, fats, and carbohydrates, is a directproof that, owing to physiological adaptation, nearly the whole ofthe intestinal absorption can be performed in the upper part ofthe small intestine. Normally, therefore, no absorption of food-stuffs worth notingtakes place in the large intestine. The absence of villi (see , p. 123) and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
