112 



ANIMAL BIOLOGY 



stream comes from the lungs where the blood has given oft 

 the carbon dioxid and received a fresh supply of oxygen . 

 The right auricle receives the blood brought from the body 

 in three large veins, while two small veins carry into the left 

 auricle the blood from the lungs. 



Artervtork 



flight auric/e 

 Artery tori$ht <7/wX '' 



ftightlung- (- 



Arteries to liver, 

 stomacn& intestines 



Jrterytoleft 

 / Jung and skm 



Artery tp left arm 

 leftcrur/c/e 

 ' fentric/e 



--Leftluny 

 -Dorsa/aorta 



FIG. 81. Arteries in the circulation of the frog. 



The blood from both auricles now flows into the single 

 ventricle, which then contracts and pumps the blood into a 

 large artery. Certain branches carry the blood having the 

 larger amounts of oxygen (i.e. the blood from the lungs) 

 to the head, trunk, legs, and other organs of the body, while 

 other branches carry the blppd just received from the body, 



