. Comparative physiology. Physiology, Comparative; Physiology, Comparative. 68 COMPARATIVE PHYSIOLOGY to about a quarter of its normal dimensions. The remaining twenty-five per cent, might be effected through the mouth or anus, or by the skin. Buddenbrock and Rohr investigated this point and found that occlusion of the mouth and anus does not reduce the total exchange of gas. The alimentary tract does not therefore contribute materially to the respiratory process. The oxygen content of the tissues was found by Buddenbrock to be in equilibrium with a partial pressure of about 76 mm. of 50 30 20
. Comparative physiology. Physiology, Comparative; Physiology, Comparative. 68 COMPARATIVE PHYSIOLOGY to about a quarter of its normal dimensions. The remaining twenty-five per cent, might be effected through the mouth or anus, or by the skin. Buddenbrock and Rohr investigated this point and found that occlusion of the mouth and anus does not reduce the total exchange of gas. The alimentary tract does not therefore contribute materially to the respiratory process. The oxygen content of the tissues was found by Buddenbrock to be in equilibrium with a partial pressure of about 76 mm. of 50 30 20. 0;:GOj. GOjv. 0 5^.. â¢â¢â 10 15 20 25 30 Fig. 15.â(After Buddenbrock and Rohr.) mercury. It might be surmised, therefore, that no effects would accompany reduction of the oxygen content of the air so long as there remained at least ten per cent. This proved to be the case. Below this point physical diffusion does not compensate for the rate at which oxygen can be used up, and the respiratory exchange falls. Very remarkable results accompany variation of the CO2 tension of the inspired air (Fig. 15). The intake of oxygen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hogben, Lancelot Thomas, 1895-. New York, The Macmillan Company
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