Elementary Physiology

Elementary Physiology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ... at 483 foot-tons, work equal to that expended in raising 483 tons one foot or 1 ton 483 feet. CHAPTER IX. THE NEEVOUS SYSTEM AND ITS FUNCTIONS. The Nervous System includes those structures by means of which all the organs of the body (p. 16) are correlated, and caused to work in harmony with one another and the surroundings. This is necessary, because, in accordance with the principle of division of physiological labour (p. 13), different parts are specialized for performing the functions of digestion, respiration, circulation, &c, and if they worked independently of one another the most disastrous results would at once follow. The nervous system, in fact, undertakes the direction and control of the whole body, and all the higher manifestations of life are dependent upon it. Take such an apparently simple matter as the maintenance of the erect position (p. 46). This depends upon the constant transmission of what may figuratively be called 'orders', from the nervous system to the muscles concerned. When a person goes into a dead faint some of the actions of the nervous system are temporarily suspended, including the sending out of these orders, and, as a result, the erect position is no longer maintained. More serious interference with the nervous system may lead to stoppage of the heart or of the respiratory movements, and in that case death ensues unless the interference is of extremely brief duration. The organs now being dealt with, consist of (1) the Central Nervous System, including the brain, spinal cord, and sympathetic ganglia--and (2) the Peripheral Nervous System, including the nerves by which these parts are brought in relation to the other organs of the body. It will not be convenient, however, to completely separate the...
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Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236644441
  • 9781236644442