. Public School Physiology and Temperance. uated under and behind the stomach, and varies in length from sixto eight inches. It bearssome resemblance to adogs tongue. The pan-creas secretes a fluid calledthe pancreatic juice, whichclosely resembles saliva inits action on the food. 19. The Liver.—Thisis the largest gland inthe body, and is situatedimmediately beneath thediaphragm, on the rightside. Its weight is about four pounds. The human liver hasthe same general appearance as that taken from the liver is divided into a right and left lobe by a deepfissure, the right being the lar
. Public School Physiology and Temperance. uated under and behind the stomach, and varies in length from sixto eight inches. It bearssome resemblance to adogs tongue. The pan-creas secretes a fluid calledthe pancreatic juice, whichclosely resembles saliva inits action on the food. 19. The Liver.—Thisis the largest gland inthe body, and is situatedimmediately beneath thediaphragm, on the rightside. Its weight is about four pounds. The human liver hasthe same general appearance as that taken from the liver is divided into a right and left lobe by a deepfissure, the right being the larger. The upper surface issmooth and rounded. In the fissure are found the blood-vessels, and a duct coming from each lobe. These ductsunite and form one channel, for carrying the bile into theintestine. At a little distance from the union of the twoducts is another, which leads off the bile when not requiredfor digestion, and stores it up in a little pear-shaped sac,called the gall bladder. After a meal the stored-up bile finds 0IL^DUCT. Fig. 24.—Section of Stomach. DIGESTION. 71 its way back again into the common duct, and flows into theintestine, to be mixed with the food. The chief function of the liver is to secrete the bile, agreenish-yellow, bitter fluid. The bile duct, as it enters theintestine, is joined by the pancreatic duct, so that these fluidsreach the food at the same point, about four inches fromthe pylorus. 20. Kinds of Food.—Before tracing the food throughthese several steps in the process of digestion, and showingthe action of the difierent secretions it meets with on itscourse, it will be necessary to classify the several varieties offood used by man. The almost universal habit of the humanrace, guided by instinct and reason, shows that a mixed dietis the best. The different kinds of teeth would even indicatethis. There are three kinds of food :I. Nitrogenous foods, or tissue Carbonaceous foods, or heat producers. III. Inorganic, or mineral
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