An Elementary Manual of Physiology; For Colleges, Schools of Nursing, of Physical Education, and of the Paractical Arts

An Elementary Manual of Physiology; For Colleges, Schools of Nursing, of Physical Education, and of the Paractical Arts

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... held under increasingly greater pressures. The same procedure should be followed in leaving the place of high pressure, because if the decompression is accomplished too hastily, the person is prone to develop the so-called caisson disease, or, as the workmen call it, the "bends." As the name suggests, one of its principal symptoms is severe muscular pain which is associated with muscular spasms; in fact, it may also be characterized by a paralysis of certain groups of muscles. The name usually applied to the latter symptom is diver's palsy. The principal danger associated with work under high degrees of barometric pressure, does not seem to lie in a disturbance of the interchange of the oxygen or carbon dioxid, but in that of the nitrogen. Obviously, the amount of this gas present in the system must be considerably increased at lower levels, for as this gas does not possess a distinct respiratory function, its molecules must be held in the body-fluids in physical solution. Further, the number of the molecules of nitrogen in these fluids must be much greater at low levels than at high levels. If the person now passes from a place of high barometric pressure (low level) into one in which the pressure is less (higher level), these molecules of nitrogen ' must seek to escape in the direction of least resistance. N o disturbances of function result when the decompression is accomplished in a very gradual manner, whereas a quick decompression invariably causes these molecules to break directly through the tissues. In this way, certain ganglion ceHs and nerve fibers are frequently destroyed which subserve muscular motion. A paralysis of the muscles innervated by these cells must be the result of such an injury. CHAPTER XX THE...
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Product details

  • 12-17
  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • United States
  • English
  • black & white illustrations
  • 1236918959
  • 9781236918956