SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 327 



EXACTLY, and therefore may act together, while their relative size and 

 expansion must be in exact ratio to the activity in the lungs. 



Arteries. 



FIG. 214. 



FIG. 215. 



Fig. 214 represents the thigh dis- 

 sected to show the large artery, 1, 

 and numerous branches of it. Notice 

 at 7 where it is over the bone, and 

 near the surface, and easily com- 

 pressed. Notice at 16 (anastomosis) 

 where a branch from below unites 

 with one from above. Notice that 

 from 10 to 19 is the region for applying a tourniquet to compress the artery. 

 Fig. 215 represents the large artery, 9, 10, of the arm beneath the inner 

 edge of the biceps, 2. Observe how it winds forward into the elbow-joint, 

 as 1 does behind the knee. Notice the anastomosis of 16. 



Describe Fig. 214. Describe Fig. 215. What does anastomosis mean? Point 

 out the position of main arteries. 



