. Animal physiology. Physiology, Comparative; Physiology, Comparative. CIRCULATION IN TADPOLE. 227 not continue to grow with the animal, but rather shrink, from the diminished supply of blood which they receive. For, during this period, the communicating branches increase in size ; so that. 3 ap av ap Fig. 131.—The Same, in a more advanced State. a considerable part of the blood which has been transmitted into the branchial arteries passes at once into the veins, and thence into the aorta, without being made to traverse the gills; its aeration being partly accomplished by the lungs. This state
. Animal physiology. Physiology, Comparative; Physiology, Comparative. CIRCULATION IN TADPOLE. 227 not continue to grow with the animal, but rather shrink, from the diminished supply of blood which they receive. For, during this period, the communicating branches increase in size ; so that. 3 ap av ap Fig. 131.—The Same, in a more advanced State. a considerable part of the blood which has been transmitted into the branchial arteries passes at once into the veins, and thence into the aorta, without being made to traverse the gills; its aeration being partly accomplished by the lungs. This state of things is seen in Fig. 131; where a p, a p are the enlarged pulmonary arteries; and where the communicating branches are seen almost to form the natural continua- tions of the branchial ar- teries. A condition of this kind exists permanently in those Animals which retain their gills during their whole lives, and have the lungs imperfectly developed (§• 97). 289. When the meta- morphosis is complete, the branchial vessels altogether disappear, but the arches still remain, as shown in Fig. 132 Q 2 br 1 br2. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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