ABSORPTION 



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pleted immediately but takes place gradually as the 

 food contents are slowly churned forward through the 

 small intestine by the contractions of its walls. 



Chyle. The bile and the pancreatic juice, when 

 mixed in the intestine with the grayish chyme, make of 

 the fat a soapy solution, or emulsion, and thereby change 

 the chyme into a white alkaline mixture known as 

 chyle. 



Villi. Up to this point, only a small amount of food 

 has been absorbed through the walls of the mouth and 



Network of capillaries 

 Epithelial membrane 



Lacteals 





Level of inner vail 

 of intestine" 



Layer of glands 

 ( mucous layer). 



. Layers of cells 

 and muscle 



FIG. 75. Small section of wall of intestine showing three villi. In A, artery, vein 

 and lacteal with their branches are represented; in B, artery, vein and branches ; 

 in C, the lacteal only. (Diagrammatic.) 



stomach into the blood-vessels. The small intestine has 

 a special mechanism by means of which practically all 

 of the digested material in the chyle is absorbed into 



