. A textbook in general zoology. Zoology. 232 FROGS, TOADS, AND SALAMANDERS motion, the body being propelled by the powerful strokes of the hind legs aided by the webbed feet. Alimentary canal. —The mouth opens into the wide gullet which, in turn, leads to the long stomach. The stomach narrows posteriorly into the intestine, which makes several turns and ends in an expanded portion, the cloaca (Fig. 162). The kidneys, oviducts, and bladder open into the cloaca. The lobed hver communicates with the an- Badibone Oviduct Spinal cord___^g^^^. -Tongue ^Glottis Liver Pancreas Fig. 162. —Internal str
. A textbook in general zoology. Zoology. 232 FROGS, TOADS, AND SALAMANDERS motion, the body being propelled by the powerful strokes of the hind legs aided by the webbed feet. Alimentary canal. —The mouth opens into the wide gullet which, in turn, leads to the long stomach. The stomach narrows posteriorly into the intestine, which makes several turns and ends in an expanded portion, the cloaca (Fig. 162). The kidneys, oviducts, and bladder open into the cloaca. The lobed hver communicates with the an- Badibone Oviduct Spinal cord___^g^^^. -Tongue ^Glottis Liver Pancreas Fig. 162. —Internal structure of a frog. terior part of the intestine through the duct of its gall bladder. A pancreas is also present, the duct of which opens into the duct of the gall sac. Excretory organs. —There are two reddish brown kid- neys lying on the dorsal side of the body cavity near the cloaca. Each one opens into'the dorsal side of the cloaca through a tube, the ureter. The bladder is found on the ventral side of the cloaca (Fig. 162). The lungs and skin do their share of excretion by getting rid of the carbon dioxide from the blood. The circulation of the frog. —The frog has a closed cir- culation and the heart is the principal organ of the circu-. 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
