File:Anatomy, physiology and hygiene for high schools (1900) (14779089794).jpg

Identifier: anatomyphysiolo00hewe (find matches)
Title: Anatomy, physiology and hygiene for high schools
Year: 1900 (1900s)
Authors: Hewes, Henry Fox, 1867-
Subjects: Physiology Health education (Secondary) Human anatomy
Publisher: New York : American Book Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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uscular tube which runs along the spinefrom throat to stomach. Its walls contain striate and plainmuscular tissue, which aids in the progress of the food. The stomach is a dilated pouch of the alimentary canal lyingin the upper part of the abdomen, and rests just below theribs on the left side. In structure its walls consist of amucous membrane and three layers of muscular tissueabout it. The mucous membrane of the stomach is lined with a singlelayer of cylindrical epithelial cells. Throughout the surfaceof the membrane are numerous shallow pits, into which openthe ducts of the gastric glands which lie imbedded in themembrane. (See diagram, p. 94.) The principal secretion of the stomach is a watery acidfluid known as the gastric juice. THE NUTRITION OF THE BODY The food enters the stomach bj^ the opening from theesophagus, the car^Ziac (Greek kardia, ^heart). Here it isthoroughly mixed with the secretions by the motions of thestomach walls, and digested. It is then pushed, by the mus-
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Section showing course of food through pharynx and esophagus. A, cavity of mouth showing teeth; B, epiglottis; C, pharynx; D, esophagus;U, soft palate ; F, nasal cavity; S, S, spine. cular action of the stomach walls, through the passage fromthe stomach to the intestines, the pijlorus (Greek jmle, gate,and oiiros, keeper). This pylorus is an opening boundedby a firm muscular rmg. During digestion in the stomach HEWES, P. & H.—7 100 PHYSIOLOGY AND HYGIENE the opening is closed most of the time by the contraction ofthe muscle. From time to time it relaxes and allows a little digested food to pass through.When all the food is digested asfar as it can be in the stomach,the whole mass passes into theintestine. The intestine (Latin intns,within) is divided into thesmall intestine and the large in-testine. It consists of a tubetwenty-five feet in length, lyingmostly in coils in the abdomen,below the liver and stomach.The coils are supported by foldsof connective tissue known asthe mese

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