Domestic economy : comprising the laws of health in their application to home life and work / by Arthur Newsholme and Margaret Eleanor Scott.

  • Newsholme, Arthur, Sir, 1857-1943.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: Domestic economy : comprising the laws of health in their application to home life and work / by Arthur Newsholme and Margaret Eleanor Scott. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    phragm forms an arched vault (fig. 2), rising up so as to make the central part of the thorax shallower than its margins. On the upper convex surface of the diaphragm the lungs and heart rest, while the liver, stomach, and spleen fit into its concave under-surface. The respiratory act consists of two parts : (1) a bieath- Fig. 26.—The Larynx, Trachea, Bronchi, and Left Lung. The right lung has been removed to show the method of branching oj the bronchi. ing-in, or inspiration, followed by (2) a breathing-out, or I expiration, with a pause between the two. In the adult I the respiratory act occurs about 17 times per minute. Inspiration is brought about by muscular action, a large I number of muscles contracting in unison. Ordinary inspira- tion is effected hy descent of the diaphragm, and elevation \ and eversion of the ribs. The elevation of the ribs is effected i by the action of intercostal muscles, assisted by some other muscles. It is evident that as the ribs move on a pivot at