Physiology and Hygiene

Physiology and Hygiene

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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. 1906 edition. Excerpt: ...WORK 167 muscles AB, and others to the intercostal muscles, Int. A study of the diagram in connection with the preceding sections will make clearer the method of the nervous control of the respiratory apparatus. Number of Respirations.--The rate of the respirations in man is about eighteen per minute in the adult. The number varies with the age, those of a child less than a year old being about forty-four per minute; from fifteen to twenty years, about twenty per minute. The rate varies much also with the activities of the body. In different animals the rate varies greatly, from once a minute in the hippopotamus, to two hundred and ten per minute in the rat. The student may easily study the different rates under the various conditions of the human body, and in many of the common animals. DIRECTIONS FOR PRACTICAL WORK. The thorax of a rabbit will answer well for examination. First remove the skin and examine the arrangement of the ribs, the cartilages and the sternum. Note how the intercostal muscles are placed. Depress and elevate the ribs and note their motion. From the abdominal side examine the diaphragm, its shape, its central tendon and muscular sides. Open one side of the chest and note that immediately the lung collapses. Note the partition between the two sides of the thorax, each occupied by a lung. Examine the relations of the heart to the lungs. Observe the manner by which the diaphragm may be moved by its own contraction, and by the action of the abdominal muscles. While the lungs are still in place, trace out the trachea and larynx in the neck. Study the structure of each, making note of the cartilaginous rings and their action. Introduce a tube into the trachea and inflate the lungs while still in the chest. Note all more

Product details

  • Paperback | 84 pages
  • 189 x 246 x 4mm | 168g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236572106
  • 9781236572103