504 



TEXTBOOK OF ZOOLOGY 



The arteries are large vessels with elastic walls and carry blood 

 from the heart to the capillary networks in the various organs and 

 tissues of the body. The arteries arise from the conus arteriosus 



1 / 



h 





Irtternal care ^^ ' 



■\uricL:.iari '--■ 



\ 



I .5»> ,-j1 



Fig. 274. — X-ray picture of bullfrog with arterial system and a portion of 

 venous system injected. All labels indicate arteries except where otherwise noted. 

 (X-ray courtesy of Dr. Malcolm B. Bowers.) 



which divides just above the auricles into a right and left truncus 

 arteriosus. Each of these trunks splits into three arches going to 



