Anatomy, physiology and hygiene . he body by means of the circu-lation. Then assimilation occurs. 1 Biliousness is not due to an excess of bile, but to deranged secretionor action of it. DIGESTION. 137 As the entire mucous membrane of the alimentary canalis well supplied with blood-vessels and lymph-vessels, itis probable that, in a smalldegree, absorption of water,common salt, and sugar oc-curs in the mouth, pharynx,and oesophagus. While thereis some absorption from thestomach, it mostly occurs inthe small intestine, with itsimmense surface and innu-merable villi. Here muchof the sugar and pe
Anatomy, physiology and hygiene . he body by means of the circu-lation. Then assimilation occurs. 1 Biliousness is not due to an excess of bile, but to deranged secretionor action of it. DIGESTION. 137 As the entire mucous membrane of the alimentary canalis well supplied with blood-vessels and lymph-vessels, itis probable that, in a smalldegree, absorption of water,common salt, and sugar oc-curs in the mouth, pharynx,and oesophagus. While thereis some absorption from thestomach, it mostly occurs inthe small intestine, with itsimmense surface and innu-merable villi. Here muchof the sugar and peptone andmost of the fat are absorbed. The lining cells of the ali-mentary canal have a select-ing power not is aided by the pushingaction of the intestine, andby the process of osmosis, — the interchange of liq-uids (or gases), separatedfrom each other by a moistanimal membrane, which hasno visible pores. The di-gested materials are soakedup by the membrane in amanner similar to the actionof blotting Fig. 61. A Diagrammatic Repi-esentation of theVarious Organs concerned in the Con-version of Food into Blood. 1, mouth and salivary glands. 2, the oesophagus. 3, the stomach. 4, a portion of the small intestine. 5, the pancreas. 6, the liver. 7, mesentery with lacteals. 8, receptacle of chyle. 9, the thoracic duct emptying its contents into the left subclavian vein. 10, branches of portal vein leading to liver. 11, an hepatic vein leading from the liver to the large ascending vein. 12, the large ascending vein cut off at its junction with the heart. 13, the large descending vein cut off in like manner. 140. Emulsified fats are absorbed by the epithelial collsof the villi, from which they find their way into thelacteals, and thence to the thoracic duct and the heart. 138 DIGESTION. Water, salts, and sugars pass into the rootlets of theportal vein, and thence to the heart. The peptones aretaken up by both lacteals and blood-vessels. In the largeintestin
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