. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 109 which supported part of the classical hypothesis. Most recent researches into this problem have confirmed the latter observa- tion. If large quantities of dye are injected, however, the blood appears to show mixing of the streams not only in the ventricle but also in their passage up the conus. Ideally, no more than 0-001 ml. of dye (Evans blue is frequently used) should be in- jected. In the frog and toad it has been observed that blood from the right a
. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 109 which supported part of the classical hypothesis. Most recent researches into this problem have confirmed the latter observa- tion. If large quantities of dye are injected, however, the blood appears to show mixing of the streams not only in the ventricle but also in their passage up the conus. Ideally, no more than 0-001 ml. of dye (Evans blue is frequently used) should be in- jected. In the frog and toad it has been observed that blood from the right and left auricles maintains its separateness during its passage up the conus although both streams enter the conus simultaneously (fig. 32). This separation is largely because of the presence of the spiral valve in these forms. Furthermore, recordings of changes in the blood pressure throughout the cardiac cycle using modern techniques have confirmed com- pletely that the pulse waves are simultaneous in all three arches in Rana, Bufo, and Xenopus. During their passage up the conus the streams of blood pass into different aortic arches because. 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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