Elementary Biology An Introduction to the Science of Life

Cover Elementary Biology An Introduction to the Science of Life
Elementary Biology An Introduction to the Science of Life
Benjamin C Benjamin Charles Gruenberg
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183. Deep breathing. A second factor in breathing is that of depth. In ordinary breathing a man at rest takes into his lungs and throws out again with each breath about 30 cubic the pharynx (/) shapeless masses of tissue (a) sometimes grow out, obstructing the movement of air from the nose and lead- ing to mouth-breathing. /, the larynx, or voice box 152 ELEMENTARY BIOLOGY inches of air. If he takes a very deep breath, his lungs receive about 130 cubic inches. By forcing out of the lungs as muc
...h air as possible and then taking a deep breath, he can take in about 230 cubic inches. When the lungs have been emptied as completely as possible by a forced expiration, they still contain some 100 cubic inches of air. The lungs do not work to full capacity in regular breathing ; that is, they are never perfectly empty, and they are rarely perfectly full.
The 30 cubic inches of ordinary tidal air will partially fill some of the air sacs of the lungs. The 100 cubic inches of additional air will fill more of the air sacs and distend them more.


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