38 



MANAGEMENT AND BREEDING OF HORSES 



understood by following its course. The left auricle re- 

 ceives the pure blood from the lungs and delivers it to the 

 left ventricle, then through the arteries, to the capillaries 

 in all parts of the body, where it is relieved of oxygen 

 and other constituents necessary to the life of the tissue 



FIG. 20.— CIRCULATORY SYSTEM 



1. Heart, right ventricle 



2. Heart, left ventricle 



3. Heart, left auricle 



4. Pulmonary artery. 



5. Pulmonary veins 



6. Anterior aorta 



7. Carotid artery 



8. Maxillary artery 



9. Left axillary artery 



10. Dorsal axillary artery 



1 1. Cervical artery 



and is loaded with waste matters. It is then returned 

 to the right auricle and delivered to the right ventricle, 

 then through its branches to the lungs, where it gives up 

 the waste materials and receives a fresh supply of oxygen, 

 (Fig. 20.) 



