. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. A^f. rm* rtona. Fio. nt. 9w. « frog'» heart, i««n from the front, the aortic arche* of the left •Ide hay- ing been removed, (1 k 4.). ea, carotid; e. gl, carotid gland; ao, loru; w'. right auricle; au", left aoricle; vena cava iuperlor; , vena cava inferior; t>. CM, pulmtMUtaneous tmnk; tr, truncne arterliwiw; v. ventricle (Howea). Pio. 818.—Tlie «ame, a
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. A^f. rm* rtona. Fio. nt. 9w. « frog'» heart, i««n from the front, the aortic arche* of the left •Ide hay- ing been removed, (1 k 4.). ea, carotid; e. gl, carotid gland; ao, loru; w'. right auricle; au", left aoricle; vena cava iuperlor; , vena cava inferior; t>. CM, pulmtMUtaneous tmnk; tr, truncne arterliwiw; v. ventricle (Howea). Pio. 818.—Tlie «ame, aeen from behind, the elnw venoaui having bMo opened (1 K 4.) , pulmonary vein- - - -'— up to •how the linn-auricnlar valve*. (J x 4.) p.», pulmonary vein; #.»,ainua veno- •oa; «a", •Inn-anricnUr valve. Other lettering as in Fig. «»(Howea), In the crocodile, however, the heart consists of four per- fectly divided chambers. Of the two aortic arches, one arises together with the pulmonary artery from the right ventricle, and, as it crosses over, the left communicates with it by a small opening, so that, although the arterial and the venous blood are completely separated in the heart, they intermingle outside of this organ. In birds the circulatory system is substantially the same as in mammals; but in all vertebrate forms below birds the blood distributed to the tissues is imperfectly oxidized oi* is partially venous. As a result of the entire vascular arrangements in the frog, etc., the least oxidized blood passes to the lungs, and the most aSrated to the head and anterior pai-ts of the animal. Whatever ground for differences of opinion there may be as to the extent to which the phenomena we have as yet been describing are mechanical in their native, all are agreed that. 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 n
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
