The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . partly arterial and partlyvenous. (Fig. 54) 96 DR J. BELL PETTIGREW ON THE Circulation in the Frog.—Leaving the aquatic reptiles, whichrespire principally by gills, I come to speak of those which respireby means of lungs, such, for example, as the chelonia, ophiclia, andsauria. The adult frog naturally introduces us to this group. Inthe frog, the circidation i
The physiology of the circulation in plants : in the lower animals, and in man : being a course of lectures delivered at surgeons' hall to the president, fellows, etc of the Royal college of surgeons of Edinburgh, in the summer of 1872 . partly arterial and partlyvenous. (Fig. 54) 96 DR J. BELL PETTIGREW ON THE Circulation in the Frog.—Leaving the aquatic reptiles, whichrespire principally by gills, I come to speak of those which respireby means of lungs, such, for example, as the chelonia, ophiclia, andsauria. The adult frog naturally introduces us to this group. Inthe frog, the circidation is very similar to that just the heart, as in the protean reptiles, consists of three cavities,two auricles and one ventricle. The lungs derive their vesselsdirectly from the first part of the aorta; branches from the aorticarches uniting to form the descending aorta. The venous blood fromthe system returns to the right auricle, the arterial blood from thepulmonic veins returning to the left. When the auricles close,the blood is mixed in the ventricle as before. The venous blood,while making the circuit of the system, circulates by a specialarrangement through the kidneys and the liver (Fig. 55). Fig. 54. Fig.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectblo, booksubjectblood
