Animal management. 



stronger than those on the right. The npper chambers are called 

 auricles from their resemblance to the human ear, while the lower, which 

 constitute the bulk of the organ, are termed ventricles. At the top of 

 each auricle is the entrance of the large veins of the body and lungs, while 

 below they communicate with their respective ventricles. From the right 



Fig. I. — Diagram to show the course of the circulation. 



Valves ot and left ventricles respectively the big arteries leading to the lungs and 



the heart, body originate. The openings between auricles and ventricles are guarded 



by strong valves, so arranged that when the ventricle is filled with blood the 



entrance is completely closed and sealed. In similar fashion the exit 



from each ventricle is closed by other valves to prevent regurgitation of 



