. Bulletin of the Geological Society of America. Geology. C. SALAMANDER ADULT D. MAMMAL Figure 1.—Diagrammatic Side View, respiratory-circulatory System of Vertebrates In the primitive plan, as shown by the selachian circulation, the blood enters the heart from the sinus venosus; thence it passes into the single auricle. This opens through a two-lipped valve into the single ventricle. From the ventricle the blood passes Into the conus arteriosus, provided with rows of valves, and thence into the ventral aorta. This divides and then subdivides into five afferent branchial arteries on each side
. Bulletin of the Geological Society of America. Geology. C. SALAMANDER ADULT D. MAMMAL Figure 1.—Diagrammatic Side View, respiratory-circulatory System of Vertebrates In the primitive plan, as shown by the selachian circulation, the blood enters the heart from the sinus venosus; thence it passes into the single auricle. This opens through a two-lipped valve into the single ventricle. From the ventricle the blood passes Into the conus arteriosus, provided with rows of valves, and thence into the ventral aorta. This divides and then subdivides into five afferent branchial arteries on each side of the pharynx, the afferent vessels to the gills. From the gills the blood passes by means of four efferent branchial arteries on each side. From the first efferent vessel the carotid and hyoidean arteries draw their blood supply for the head. The four efferent branchial arteries unite into the dorsal aorta, whose branches supply the body. This is as much detail as the diagram shows. fectly separates the single auricle of the fish-heart into a right and left auricle; the deoxygenated or impure blood from the body is received into the right side; the oxygenated or pure blood from the lung is received into the left. In the contraction of the heart the pure and impure blood are not separated by any wall in the ventricle and become more or less intermingled. The head, however, receives fairly pure blood, the body somewhat mixed blood, and the lungs mostly impure blood. In the frog. 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 Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
