. The comparative physiology of respiratory mechanisms. Respiration. 74 RESPIRATORY MECHANISMS than the lungs in mammals. Vos (1935) determined the volume of the air-sacs in the inspiratory position (less the cervicals) in a duck of kg to 280 ml or 20% of the whole body (Table 7, p. 75). By the respiratory movements in the normal standing posi- tion of a bird the whole thoracic and abdominal cavity is enlarged in inspiration and air is sucked into the lungs and air-sacs. This was first clearly recognized by Soum (1896) and a recent detailed study was made by Zimmer (1935). The movements ar
. The comparative physiology of respiratory mechanisms. Respiration. 74 RESPIRATORY MECHANISMS than the lungs in mammals. Vos (1935) determined the volume of the air-sacs in the inspiratory position (less the cervicals) in a duck of kg to 280 ml or 20% of the whole body (Table 7, p. 75). By the respiratory movements in the normal standing posi- tion of a bird the whole thoracic and abdominal cavity is enlarged in inspiration and air is sucked into the lungs and air-sacs. This was first clearly recognized by Soum (1896) and a recent detailed study was made by Zimmer (1935). The movements are shown in figs. 46 and 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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