This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...is the mixing of the food with the saliva during the act of mastication. The saliva is constantly bathing the mucous membranes of the oral cavity and its contents; however, during mastication there is a marked increase of this complex fluid secreted from the salivary glands--parotid, submaxillary and sublingual, and ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...is the mixing of the food with the saliva during the act of mastication. The saliva is constantly bathing the mucous membranes of the oral cavity and its contents; however, during mastication there is a marked increase of this complex fluid secreted from the salivary glands--parotid, submaxillary and sublingual, and palatine glands in the roof of the mouth. The Saliva.--This is a complex chemic fluid composed of the mixed secretions of all the salivary glands. It is a frothy, slightly turbid, viscid fluid. Its reaction under normal conditions is alkaline. It may be neutral or acid in some individuals, in which fermentation is going on from decayed teeth or particles of food lying in the recesses of the teeth and mouth, or disorders of digestion. Under the microscope, the saliva will show epithelial cells, salivary corpuscles resembling white corpuscles, particles of food, and various microorganisms (germs). The Physiologic Actions of Saliva.--The constant presence of saliva in the mouth is essential to the process of digestion. It has a double duty to perform, called physical and chemical. Physically the mucin present in the saliva forms the particles of food into a consistent mass after the food has been softened and moistened while mastication has been going on, and renders it in such shape to be swallowed (deglutition). The Chemical Action of Saliva.--Its main property is the changing or converting of starch into sugar by the means of a starch-changing ferment or enzyme, which is supposed to belong to the group of proteins, called ptyalin, in the saliva. Deglutition (the act of swallowing).--This is a complicated function due to the action of the muscles of the tongue, soft palate, pharynx, and esophagus acting upon the food, called a bolus after it has ...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Very Good. No Jacket. 8vo-over 7¾"-9¾" tall. First printing. 483 pp. including index. With 149 engravings and 4 plates. Light shelfwear, with small worn-through spots to the corners and spine ends. Previous owner's name is on the front pastedown and front free endpaper. Otherwise fine.