. Elementary biology, animal and human. Biology. RESPIRATION AND ENERGY IN MAN 125 shown in Fig. 39), and then through the two nasal passages it enters the throat cavity. In the lower region of the throat is the slit-like glottis opening, through which the air enters the larynx or voice box. The latter, commonly known as "Adam's apple," projects some- what on the front of the neck. Below the larynx is the contin- uation of the windpipe, which, just above the level of the heart, divides into two main branches (Fig. 40), one of which supplies air to the right lung, the other to the lef
. Elementary biology, animal and human. Biology. RESPIRATION AND ENERGY IN MAN 125 shown in Fig. 39), and then through the two nasal passages it enters the throat cavity. In the lower region of the throat is the slit-like glottis opening, through which the air enters the larynx or voice box. The latter, commonly known as "Adam's apple," projects some- what on the front of the neck. Below the larynx is the contin- uation of the windpipe, which, just above the level of the heart, divides into two main branches (Fig. 40), one of which supplies air to the right lung, the other to the left limg. Within the lungs these tubes branch off into a vast number of very small pipes, called bronchial tubes. The finest divisions of these tubes open into extremely thin-walled air sacs (Fig. 41).. 177. The nose cavity. — The openings into the nasal passages are guarded by a mass of pro- jecting hairs, by means of which a considerable amount of dust is kept from entering the lungs. The nose itself is lined by mu- cous membrane which covers the whole interior of the nasal chambers. Its mucous secretion collects most of the dirt and germs that hs,ve passed the hairs in the nostrils. Fig. 39, — Longitudinal section of head and neck showing food and air passages. a = vertebral column. b = gullet. c = windpipe. d = larynx. 'e = epiglottis. / = uvula. g = opening of left Eustachian tube. h = opening to tear duct. k = tongue. I = hard Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1912
