. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 105 also rows of semi-lunar valves in the conus which perform a similar function between the ventral aorta and the ventricle. The circulation of teleosts is fundamentally the same as that described for a cartilaginous fish but here the conus has been lost and is only represented by these semi-lunar valves at the base of the bulbus arteriosus. This latter swell- ing of the base of the aorta is non-contractile, and functions to even out the pressure wave of ve
. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. THE HEART AND CIRCULATORY SYSTEM 105 also rows of semi-lunar valves in the conus which perform a similar function between the ventral aorta and the ventricle. The circulation of teleosts is fundamentally the same as that described for a cartilaginous fish but here the conus has been lost and is only represented by these semi-lunar valves at the base of the bulbus arteriosus. This latter swell- ing of the base of the aorta is non-contractile, and functions to even out the pressure wave of ventricular systole.* The teleost heart is not usually surrounded by a rigid pericardial box although its walls will tend to maintain a constant volume and thus the heart may still have some aspiratory action assisting the venous return. The veins are much smaller in cross-sectional area and this, together with other modifications of the detailed. 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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