. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 366 ANIMAL PHYSIOLOGY. thoracic chamber may be said to be reserved for circulatory and respiratory organs which, we again point out, are so related that they really form parts of one system. The mammal's blood reqiiires so much aeration (ventilation) that the lungs are very large and the respiratory system has become greatly specialized. We no longer find the skin or ali- mentary canal taking any large share in the process; and the lungs and the me
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 366 ANIMAL PHYSIOLOGY. thoracic chamber may be said to be reserved for circulatory and respiratory organs which, we again point out, are so related that they really form parts of one system. The mammal's blood reqiiires so much aeration (ventilation) that the lungs are very large and the respiratory system has become greatly specialized. We no longer find the skin or ali- mentary canal taking any large share in the process; and the lungs and the mechanisms by which they are made to move the gases with which the blood and tissues are concerned become very Fig. 296.—Bronchia and lungs, posterior view (Sappey). 1. 1. summit of lungs ; 2, 2, base of lungs ; 3, trachea ; 4, right bronchus; 5, division to upper lobe of lung; 6, division to lower lobe ; 7, left bronchus ; 8. division to upper lobe ; 9, division to lower lobe ; 10. left branch of pulmonary artery ; 11, right branch ; 12, left auricle of heart; 13, left superior pulmonary vein ; 14, left inferior pulmonary vein ; 15, right superior pulmonary vein : 16, right inferior pulmonary vein ; 17. inferior vena cava ; 18, left ventricle of heart; 19, right ventricle. Our studies of muscle physiology should have made clear the fact that tissue-life implies the constant consumption of oxygen and discharge of carbonic anhydride, and that the pro- cesses which give rise to this are going on at a rapid rate; so that the demands of the animal for oxygen constantly may be readily understood if one assumes, what can be shown, though less readily than in the case of muscle, that all the tissues are constantly craving, as it were, for this essential oxygen—well called " vital ;. 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 m
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