. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE RESPIRATORY SYSTEM. 381. Fia. 314.—Tracings of respiration of horse wlien at rest and after exercise (after Thanhoffer). /, inspiration ; E, expiration. Spaces between vertical lines indicate time periods of one second each. 1, animal standing at rest; 3, after .walk of few minutes ; 7 and' 8, after trotting ; 9, after a brief rest; 11, after trotting and running for some minutes ; 17, after resting from last for a short time ; SI, tracing at e
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. THE RESPIRATORY SYSTEM. 381. Fia. 314.—Tracings of respiration of horse wlien at rest and after exercise (after Thanhoffer). /, inspiration ; E, expiration. Spaces between vertical lines indicate time periods of one second each. 1, animal standing at rest; 3, after .walk of few minutes ; 7 and' 8, after trotting ; 9, after a brief rest; 11, after trotting and running for some minutes ; 17, after resting from last for a short time ; SI, tracing at end of experiment. Respiratory Sounds.—The entrance and exit of air are accom- panied by certain sounds, which vary with each part of the respiratory tract To these sounds names have been given, but as they are somewhat inconstant in their application, or at least have several synonyms, we pass them by, recommending the student to actually learn the nature of the respiratory murmurs by listening to the normal chest in both man and the lower ani- mals. With the use of a double stethoscope he may practice upon himself, though not so advantageously as in the case of the heart. The sounds are caused in part by the friction of the air, though they are probably complex, several factors entering into their causation. Comparison op the Inspired and Expired Air. The changes that take place in the air respired may be briefly stated as follows:. 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 Mills, Wesley, 1847-1915. New York, D. Appleton
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