112 



ANIMAL BIOLOGY 



stream comes from the lungs where the blood has given off 

 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. 



/^ight auric/e 

 /Irtery to right arm>< 



fiightlung- 



//■/er/es/o liver, -^■■ 

 stomaciiS intestines 



Merytoieft 

 'lung and skin 



/Irtery (0 left arm 

 ■leftaurick 



-leftlung 

 ■Dorsa/aorta 



-.^Arteries to 

 kidneys 



'••^/Cidneys 

 ^•-Arteries to legs 



A 



FiQ. 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 blood just received from the body, 



