. A text-book of human physiology . nnpiiM. Fig. 136.—The elimination of carbon dioxide, in two-hour periods, by an eleven-year-old slept between 10:30 and 8 . some facts concerning the variations in the normal output of carbon dioxide(Figs. 134, 135, and 13fi) estimated for two-hour periods. In view of the many circumstances which affect the amount of metabolismand therefore the output of CO.,, it is impossible to specify in a few figures 346 RESPIRATION the quantities excreted daily. In a man not at work it can be estimated onthe basis of direct observations for twenty-four-
. A text-book of human physiology . nnpiiM. Fig. 136.—The elimination of carbon dioxide, in two-hour periods, by an eleven-year-old slept between 10:30 and 8 . some facts concerning the variations in the normal output of carbon dioxide(Figs. 134, 135, and 13fi) estimated for two-hour periods. In view of the many circumstances which affect the amount of metabolismand therefore the output of CO.,, it is impossible to specify in a few figures 346 RESPIRATION the quantities excreted daily. In a man not at work it can be estimated onthe basis of direct observations for twenty-four-hour periods at g. per hourper kilogram of body weight, which for a person of the average weight of70 kg. would amount to 35 g. per hour and 840 g., or 427 1. per twenty-fourhours. At heavy physical labor the hourly output of COo may rise to 169 higher; in complete bodily rest it falls to about 30 g. per hour (Fig. 134).The intake of oxygen, like the output of carbon dioxide depends upon thefood, work, temperature, age, etc. Wi
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