File:Kirkes' handbook of physiology (1907) (14583366847).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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o changefrom various circumstances. From every volume of air inspired 4 to 5 percent of oxygen is abstracted; while a rather smaller quantity, 4.38 per cent,of carbon dioxide is added in its place; the expired air will contain, there-fore, 438 volumes of carbon dioxide in 10,000. The total quantity of carbondioxide exhaled into the air breathed by a healthy adult, calculating that15.4 c.c. of the 350C.C. of the average air breathed out at each expiration con-sists of carbon dioxide, and that the rate of respiration is on an average 16,would be about 400 liters in the twenty-four hours. From actual experiment this 204 RESPIRATION amount seems to be a trifle too great, since from the average of many inves-tigations the total amount of carbon dioxide excreted per day by the entirebody has been found to be about 400 liters, weighing 800 grams, and con-sisting of 218 grams of carbon, and 582 grams of oxygen. From the 218grams of carbon must be deducted about 10 grams excreted in other ways
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Fig. 236.—Apparatus for Estimating 02 and C02 in Expired Air. (Waller.) than by the lungs, which leaves about 215 grams as the amount of carbon ex-creted by the average healthy man by respiration each day and night. Thesequantities must be considered approximate only, inasmuch as various cir-cumstances, even in health, influence the amount of carbon dioxide excreted,and, correlatively, the amount of oxygen absorbed. Circumstances Influencing the Amount of Carbon Dioxide Excreted. Age and Sex.The quantity of carbon dioxide exhaled into the air breathed by males, regularly in-creases from 8 to 30 years of age; from 30 to 50 the quantity, after remaining stationary fora while, gradually diminishes, and from 50 to extreme age it goes on diminishing, till itscarcely exceeds the quantity exhaled at 10 years old. In females (in whom the quantityexhaled is always less than in males of the same age) the same regular increase in quantitygoes on from the 8th year to the age of puberty, when th

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