. A text-book of human physiology . dation because the oxygen contained in their molecule is not sufficientfor the complete saturation of their hydrogen. Consequently when thesesubstances are being burned the respiratory quotient will be less than 1—forfats and for proteid (Fat contains on the average per cent C,12 per cent H, per cent 0; proteid (dry muscle) per cent C, cent H, per cent N and per cent 0, of which per cent C, per cent H, per cent N, and per cent 0 are eliminated in theurine and faeces, per cent C,
. A text-book of human physiology . dation because the oxygen contained in their molecule is not sufficientfor the complete saturation of their hydrogen. Consequently when thesesubstances are being burned the respiratory quotient will be less than 1—forfats and for proteid (Fat contains on the average per cent C,12 per cent H, per cent 0; proteid (dry muscle) per cent C, cent H, per cent N and per cent 0, of which per cent C, per cent H, per cent N, and per cent 0 are eliminated in theurine and faeces, per cent C, per cent H, and per cent 0to be eliminated in the breath.) Since it only rarely happens that carbohy-drates alone are burned in the body, the respiratory quotient as a rule is 344 RESPIRATION less than 1, and with ordinary food may be estimated at about Whenfat is being formed from carbohydrates and being stored the respiratoryquotient may exceed 1. Keduced to dryness and to 0° the expired air, therefore, has a smaller. 10 12 2 Fig. 135.—The elimination of carbon dioxide: on ordinary diet (mean for three davs); and while fasting (mean for five days). All the determinations were made on the same individual, a man twenty-five years old. On the food days he sleptbetween 12 oclock midnight and 6 On the fasting days he slept between 10 6 volume than the inspired air. Measured directly its volume is greater becauseof its water vapor and higher temperature. For example, let us suppose that the inspired air (500 ) has a tempera-ture of 20° C, and that it is saturated with water vapor at this temperature(tension mm. Hg.). Expired air, we will suppose, has a temperature ° C, is saturated with water vapor (tension at this temperature 47 mm. Hg.)has lost per cent oxygen and has gained per cent carbon directly then the expired air would have a volume of —i. e.,approximately one-ninth great
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