. The comparative physiology of respiratory mechanisms. Respiration. 6 RESPIRATORY MECHANISMS groups, is shown in Fig. 1. In several cases the increase in metabolism with temperature is even larger than expressed by this curve. When studied at increasing temperature the metabolism will be found to increase according to the individual curve. 25' Fig. 1. The relation between temperature and resting metabolism in a frog, toad, goldfish, mosquito and a young dog. Ordinate in arbitrary units. (Krogh.) only up to a certain point. Beyond that there is usually only a slight further increase and then a
. The comparative physiology of respiratory mechanisms. Respiration. 6 RESPIRATORY MECHANISMS groups, is shown in Fig. 1. In several cases the increase in metabolism with temperature is even larger than expressed by this curve. When studied at increasing temperature the metabolism will be found to increase according to the individual curve. 25' Fig. 1. The relation between temperature and resting metabolism in a frog, toad, goldfish, mosquito and a young dog. Ordinate in arbitrary units. (Krogh.) only up to a certain point. Beyond that there is usually only a slight further increase and then a definite irreversible drop, indicating that the high temperature is harmful and rapidly fatal. The influence of activity. The effects on the call for oxygen so far discussed are from the point of view of the efficiency of respiratory organs of secondary importance only, because they affect the minimum requirements, and the respiratory organs must be able to meet the maximum requirements during activity. These requirements are not known, even approxi- mately, except in a small number of cases. We can state generally that the possible rate of sustained activity stands in some relation to the body temperature. This is common knowledge as regards, for instance, flies or. 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 Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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