. Animal physiology. Physiology, Comparative; Physiology, Comparative. 226 CIRCULATION IN TADPOLE. aerated by passing through their filaments, it is collected by the branchial veins (#&, vb). Of these, the first pair transmits its. vb 3 a op av c ab 2 Fro. 130.—Blood-vessels of the Tadpole, in first State. blood by the vessels o, o, t, (which are also formed in part by the second pair) to the head and upper extremities; whilst the greater part of the blood of the second pair, with the whole of that of the third, is discharged into the trunk c on either side. By the union of that vessel wit
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 226 CIRCULATION IN TADPOLE. aerated by passing through their filaments, it is collected by the branchial veins (#&, vb). Of these, the first pair transmits its. vb 3 a op av c ab 2 Fro. 130.—Blood-vessels of the Tadpole, in first State. blood by the vessels o, o, t, (which are also formed in part by the second pair) to the head and upper extremities; whilst the greater part of the blood of the second pair, with the whole of that of the third, is discharged into the trunk c on either side. By the union of that vessel with its fellow, the trunk a v is formed ; which conveys the blood that has been aerated in the gills, to the general system, and is thus to be evidently regarded as the aorta. But we find here three small vessels (1, 2, and 3), which do not exist in the Fish; and which establish a communication between the bronchial arteries and the bronchial veins, in such a manner, that the blood may pass from the former into the latter, without going through the filaments of the gills. These communicating vessels are very small in the Tadpole, and scarcely any blood passes through them ; but it is chiefly by their enlargement, that the course of the blood is subsequently altered. There is also a fourth branch, a p, which proceeds to the lungs on either side ; and as these organs are not yet developed, this pulmonary artery also is at first of very small size. 288. As the metamorphosis of the other parts proceeds, however, and the animal is being prepared for its new mode of life, the lungs are gradually developed, and the pulmonary artery greatly increases in size ; whilst the gills, on the other hand, do. 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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