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18 THE BREATHING APPARATUS.
otherwise the air would not enter thein, and that they are elastic, otherwise they would not stretch, and inasmuch as the lungs keep their shape when distended it proves that the air can reach every part of them. As soon as |
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Fig. 11.—The Lungs. |
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Showing the hollow Air Cells, the hollow Bronchial Tubes, the hollow Windpipe W ; C, Cricoid Cartilage ; T, Thyroid Cartilage ; H, Hyoid Bone. N.B.— The channel of communication between the Air Cells and the Larynx.
the stretching is completed and the force removed, the lungs collapse and the air is pushed out by the elastic recoil. Forcing the air into the lungs and stretching the elastic tissue represents inspiration, and the elastic recoil of the lungs themselves, causing the ejection of the air, represents expiration. |
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