. Fig. 7.—Arterial System of Xenopus and Rana. Cut out the heart, leaving attached to it as much as possible of the large vessels. Note the sinus venosus, truncus arteriosus, auricles, and ventricle. Open the auricles and observe the division between them and the openings of the veins passing into them. Make a section through the auricles and ventricle noting the thick muscular walls of the ventricle and the valves between it and the auricles. 22

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