. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Respiration and Metaholism 221 vided by forces of physical diffusion and docs not require the additional process of secretion as Haldane'â ''â¢' contended earlier.''^- "* Mice when administered carbon dioxide containing the radioactive isotope C'^ show a rapid two-way exchange of the gas across the lung surface with a total effective transfer from the blood to the ;''" In birds the characteristic lung mechanism equipped with air sacs permits a two-way flushing of the lungs and provides for
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Respiration and Metaholism 221 vided by forces of physical diffusion and docs not require the additional process of secretion as Haldane'â ''â¢' contended earlier.''^- "* Mice when administered carbon dioxide containing the radioactive isotope C'^ show a rapid two-way exchange of the gas across the lung surface with a total effective transfer from the blood to the ;''" In birds the characteristic lung mechanism equipped with air sacs permits a two-way flushing of the lungs and provides for gas exchange during both inspiration and expiration (Fig. 42). Calculations by Krogh-"' indicate that. Fig. 42. Lungs and air sacs of pigeon photographed from a metal cast. From ;" three fourths of the total inspiration (tidal volume) is taken up by air sacs and one fourth by the lungs themselves. The respiratory exchange is auto- maticallv increased during flight by the synchronization of wing and respira- tory movements. Similar coordination between respiration and flight move- ments occurs in bats.''^'' The lung tvpe of respiratory mechanism is advantageous not only by virtue of size and of adaptabilit\- to homoiothermic activities, but also by reason of the protection provided against mechanical damage and dehydration, and as further opportunity for efficient xentilation. Lungs, probably derived from the. 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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