. Physiology, experimental and descriptive . a series of horse-shoes piled on top of each other) bridged, by tough fibroustissue, with much elastic tissue, and with plain muscle fibers;these last-mentioned structures are very abundant in thesmaller air tubes. The lining ofthe trachea is aMucous pours out onits surface a sub-stance somewhatlike white-of-egg,called keeps the air moist, and catches particles of dust, etc., that are in theinspired air. There is a constant slow current of mucustoward the throat, whence it is, from time to time, hawked current of mucus
. Physiology, experimental and descriptive . a series of horse-shoes piled on top of each other) bridged, by tough fibroustissue, with much elastic tissue, and with plain muscle fibers;these last-mentioned structures are very abundant in thesmaller air tubes. The lining ofthe trachea is aMucous pours out onits surface a sub-stance somewhatlike white-of-egg,called keeps the air moist, and catches particles of dust, etc., that are in theinspired air. There is a constant slow current of mucustoward the throat, whence it is, from time to time, hawked current of mucus is caused by the Cilia projecting fromthe lining cells of tin trachea. They are little hairlike pro-jections, in countless numbers, like a field of grass, each stalkhaving the power of bending back and forth, making a quickstroke toward the throat, then a slower recover stroke. Thusthe united wavelike action of the myriads of lashing ciliapaddles the mucus headward. (See page 388.) All the cavities and passages in the body to which the air. Fig. 41. Ciliated Cells Lining the Air Tubes. 108 LUNGS AND PLEURA. Pleural Space -(Exaggerated) Chest Wall - -
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