The Art of Breathing.

Otago Witness, Issue 1934, 19 March 1891, Page 38

The Art of Breathing.

In each respiration an adult inhales one pint of air. A healthy man respires 16 to 20 times a jrinute, or 20,000 times a day; a child 25 or 35 times a minute. While standing, an adult respiration is 22 times a minute; while lying down, 13. The superficial surface of the lungs, i. c., of their alveolar space, is 200 &qnare yards. The amount of air expired every 24 hours is about 10,000 quarts. The amount of oxygen absorbed in 24 hours is 500 litres (about 744 grams). Tiie amount of carbonic acid expired in the same time is 400 litres (911.5 grams). Two-thirds of the oxygen absorbed in 24 hours is absorbed during the night hours, trom 6 p.m. to 9 a.m. ; three-fifths of the total is thrown off daring the day. A pulmonary surface gives off 150 grams of water daily in the state of vapour. An adult must h ive at least 360 litres of air in an hour. The heart sends 800 quarts of blood through tbe lungs every hour, or about 5000 daily. The duration of inspiration is five-twelfths of. expiration, seven-twelfths of the whole respiratory act. Dining sleep, inspiration occupies ten - twelfths of the respiratory period.

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