File:An elementary physiology and hygiene for use in upper grammar grades (1910) (14802947043).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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esto keep his mouth moist during exercise, gum chewingmay be useful. Under ordinary circumstances, how-ever, not only is the habit vulgar and impolite to thepeople about us, but the constantly stimulated actionof the salivary glands is probably injurious. 44 PHYSIOLOGY AND HYGIENE Tonsils. — At the back of the mouth, as may be seenin Figure 10, there is a large opening leading to thethroat. As soon as the food is chewed and moistenedit is pushed back by the tongue through this opening.At each side of the opening may be seen a small rounded bodycalled a tonsil.Sometimeswhen a per-son has takencold, the ton-sils becomeswollen,and akind of sorethroat calledtonsilitis re-sults. It isnot knownwhether thetonsils havea special useor not. The Throat.— A cavity,called thethroat, is situ-ated just back of the mouth. Into this the food passesafter being chewed. The upper part of the throatopens into the nasal cavity, and from there, by way ofthe nostrils, to the exterior. Thus both the mouth
Text Appearing After Image:
Fig. 12. — A Section through the Head.Showing the relation of mouth, throat, etc. DIGESTION 45 and the nostrils are connected directly with the throat.Figure 12 shows this relation. Two large tubes open downward from the throat.One, the gullet or oesophagus, extends to the stomach;the other, the windpipe or trachea, connects with thelungs. The windpipe is placed in front of the oesopha-gus, and it opens at the top, so that the air webreathe may pass into it readily. The opening is theglottis. If a particle of food drops into the windpipe,it causes violent coughing and sometimes choking.To keep food from entering the windpipe as it passesover the entrance on the way to the gullet, the wind-pipe is provided with an elastic lid, somewhat like softIndia rubber, which rests upon the opening. When we are breathing, this lid, which is called theepiglottis, is lifted as in the illustration (Fig. 12); butas food passes from the mouth, the lid closes for themoment so as completely to cover th

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