. The feeding of animals. Feeds. 142 THE FEEDING OF ANIMALS. these vessels the blood is mov- ing in a constant stream, which we call the circulation. It does not move of itself, but is forced along by a very powerful pump, the heart. This is a highly muscular organ divided into four chambers, which are sepa- rated by valves and partitions, the two upper chambers being called the right and left auri- cles, and the two lower the right and left ventricles. The right auricle is above the right ventri- cle and is separated from it by a valve, and the same is true of the left am-icle and ventricle.
. The feeding of animals. Feeds. 142 THE FEEDING OF ANIMALS. these vessels the blood is mov- ing in a constant stream, which we call the circulation. It does not move of itself, but is forced along by a very powerful pump, the heart. This is a highly muscular organ divided into four chambers, which are sepa- rated by valves and partitions, the two upper chambers being called the right and left auri- cles, and the two lower the right and left ventricles. The right auricle is above the right ventri- cle and is separated from it by a valve, and the same is true of the left am-icle and ventricle. (Fig. 7.) 203. Circulation of bloody— Out of the left ventricle the blood is pumped into the arteries and, after reaching the arterial capillaries throughout the entire body, it passes from these into the smallest divisions of the veins and comes back to the heart along the venous system, entering the right auricle. It is then carried to the Ixmgs by Fig. 8. Diagram of circulation. 1, heart; S, lungs; S, head and upper extremities; 4i spleen; S, intestine; 6, kidney; 7, lower extremities; S, liver. (Collins.). 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 Jordan, Whitman H. (Whitman Howard), 1851-1931. New York, The Macmillan Company
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