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A Manual of School Hygiene; Written for the Guidance of Teachers in Day-Schools

A Manual of School Hygiene; Written for the Guidance of Teachers in Day-Schools


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About the Book

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.1901 Excerpt: ... CHAPTER XII. EXERCISE. i. General considerations. The chief use of exercise is to vivify and purify the blood. The function of the blood, roughly stated, is the conveyance of two things to the tissues, oxygen and food. Oxygen is the prime vital necessity. A man can live some days without food, but deprived of oxygen dies in a few minutes. Life is a process of combustion maintained by the oxygen of the air exactly in the same manner as a fire burns in a grate. If the air is blown through the fire by the bellows the fire burns briskly, the carbon of the coal combines with the oxygen to form carbonic acid which escapes by the chimney. Smoke is unconsumed carbon; with a bad draught the more smoke and the more ashes and cinders to clog the grate; with no draught the fire goes out, though the grate may be full of fuel. By an economical arrangement, common in Nature, the lungs are both the bellows for the supply of oxygen and the chimney for the removal of carbonic acid. Inspiration is the act of supplying oxygen, expiration of removing carbonic acid (and other products). Air which has been once breathed is stated to have lost 5 per cent. oxygen and gained 5 per cent. carbonic acid. The amount of carbonic acid exhaled by an adult in 24 hours represents about 8 ounces solid charcoal. The lungs consist of two bags, with their inner surfaces enormously extended by subdivision of the bronchial tubes. On these surfaces is spread a network of tubes called from their hairlike fineness capillaries, which convey the blood. The walls of these tubes are excessively thin so that gases pass easily through them. The blood is pumped into the lungs about 70 times a minute. Air to meet it is inhaled about 20 times a minute. The blood as it enters the lungs is loaded with carbonic ...


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Product Details
  • ISBN-13: 9781151079312
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1151079316
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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