PHYSIOLOGY FOR BEGINNERS 



of the lungs, and piercing the diaphragm enters the abdomen. 

 In the abdomen it gives branches to all the abdominal organs 

 and to the walls of the abdomen, and then divides into two 

 main arteries, one for each leg. 



FIG. 45. Diagram of the course 

 of the circulation represented 

 as viewed from behind. 



L.A., left auricle; L.V., left 

 ventricle; Ao, aorta; A 1 , 

 arteries to upper part of body ; 

 A-, arteries to lower part of 

 body ; H.A., hepatic artery to 

 liver ; K 1 , veins of upper part 

 of body ; / '-, veins of lower 

 part of body; V.P, portal vein ; 

 ff.y, hepatic vein; V.C.I, 

 inferior vena cava; V.C.S, 

 superior vena cava; K.A., 

 right auricle; K.l r ., right 

 ventricle; P.A., pulmonary 

 artery ; P. V., pulmonary vein ; 

 4",lungs; ^4/,alimentary canal, 

 Lr, Liver ; Ly, lymphatics ; 

 Let, lacteals ; Th.D, thoracic 

 duct. The arrows indicate the 

 course of the blood and lymph. 

 The vessels carrying arterial 

 blood have thick outlines, 

 those carrying venous blood 

 have thin outlines. The capil- 

 laries are represented by the 

 network of tubes between the 

 arteries and the veins. 



17..Q 



TEE 



The figure is a mere diagram or 

 plan of the course of the circula- 

 tion, and does not show the manner 

 in which the vessels branch or the 

 distribution of the branches. 



The veins bringing the blood back from the arms unite to 

 from the right and left subclavian veins, and the veins 

 of the head and neck unite to form veins the largest of which 

 are the external jugular veins, one on each side. The 



