. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 115 pumps blood into the right ventricle which communicates with both the pulmonary and left systemic arches. A feature which is peculiar to the crocodile heart is found shortly after the two systemic arches have arisen from the two ventricles. In this region there is a smsdl foramen ofPanizza. The differences between various extant reptiles are not sur- prising when it is remembered that they are derived from stocks which have been separate for a very long
. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 115 pumps blood into the right ventricle which communicates with both the pulmonary and left systemic arches. A feature which is peculiar to the crocodile heart is found shortly after the two systemic arches have arisen from the two ventricles. In this region there is a smsdl foramen ofPanizza. The differences between various extant reptiles are not sur- prising when it is remembered that they are derived from stocks which have been separate for a very long time. The crocodile heart is of particular interest because it is easy to derive that of (a) CROCODILE (b) BIRD Right pulmonary Right systemic Left carotid. Left pulmonary artery Fig. 34. Ventral views of the hearts of (a) a crocodile, and (b) a bird. birds from it. Thus from fig. 34 it is clear that closure of the fora- men ofPanizza, together with the loss of the left systemic, would lead to a complete double circulation which would be funda-. 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 Hughes, G. M. (George Morgan). Cambridge, Mass. , Harvard University Press
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