File:An elementary physiology and hygiene for use in upper grammar grades (1910) (14596447218).jpg

Identifier: elementaryphysio00conn (find matches)
Title: An elementary physiology and hygiene for use in upper grammar grades
Year: 1910 (1910s)
Authors: Conn, Herbert William, 1859- (from old catalog)
Subjects: Physiology
Publisher: New York, Boston (etc.) Silver, Burdett and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Eig. 10,—The Mouth.Showing the opening into the throat. DIGESTION 41 Figure 10 shows the open mouth as it appears whenwe look within. Notice the palate and the uvula.By placing the tip of the tongue on the roof of themouth just inside the upper teeth and drawing thetongue slowly backward over the roof of the mouth,we can discover the difference between the hard andsoft portions of the palate. Salivary Glands.—If some one says the word lemon,our mouths are aptto water, as we thinkhow sour the juiceof the lemon is. Thefluid which moistensthe mouth, andwhose flow is thusincreased by the aidof the imagination,comes from theorgans known as thesalivary glands. Theliquid produced iscalled saliva. Thereare three pairs ofsalivary glands.Those who have hadthe mumps can locate one of these pairs of glands without difficulty. Theseare the parotid glands, which are inflamed and swollenin that painful disease. They are situated just belowand a little in front of the ears. There are two sali-
Text Appearing After Image:
Glands Fig. 11.—A Diagram of the Side ofthe Face. Showing the position of the salivary-glands and their ducts. 42 PHYSIOLOGY AND HYGIENE vary glands under the lower jaw and two more beneaththe tongue. All these glands are connected with themouth by little tubes, called ducts, which carry thesaliva from the glands into the mouth. The salivais poured out of the tubes whenever it is needed.Although the salivary glands are constantly sendingout enough saliva to keep the mouth moist, the act ofchewing stimulates the action of the glands so that theamount is largely increased. Figure 11 shows the salivary glands on one side ofthe face, also the ducts that connect them with themouth. FOOD IN THE MOUTH AND THROAT Need of Mastication. — After we have taken a bite ofbread and butter, the first step towards its digestion ischewing or mastication. We chew our food to breakit into small pieces so that the saliva may becomethoroughly mixed with the food, and also that the di-gestive juices may

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