. The comparative physiology of respiratory mechanisms. Respiration. Fig. 46 Fig. 47 Fig. 46. Lateral view of respiratory thorax movements in standing bird- (Zimmer.) Fig. 47. Frontal view of respiratory movements. Dotted line inspiration. (Zimmer.) A study of the distribution of the inspired air between the lungs and the separate air-sacs presents very formidable ex- perimental difficulties, and from the literature anything but a clear and consistent picture can be obtained. Some in- formation is available, however. The lungs are expanded in inspiration mainly by the pull of the ribs, as obse
. The comparative physiology of respiratory mechanisms. Respiration. Fig. 46 Fig. 47 Fig. 46. Lateral view of respiratory thorax movements in standing bird- (Zimmer.) Fig. 47. Frontal view of respiratory movements. Dotted line inspiration. (Zimmer.) A study of the distribution of the inspired air between the lungs and the separate air-sacs presents very formidable ex- perimental difficulties, and from the literature anything but a clear and consistent picture can be obtained. Some in- formation is available, however. The lungs are expanded in inspiration mainly by the pull of the ribs, as observed by Scharnke (1938) and others, but just how much it has been impossible so far to find out. A pigeon on which all the air-sacs have been broadly opened gets very dyspnoeic, but is not asphyxiated. Experiment by Vos (1935), in which a duck was suddenly given pure oxygen to breathe and the 02 percentage in the single air-sacs measured after a few respirations, go to show. 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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