548 



VERTEBRATE LIFE AND ORGANIZATION 



Deep cepVia.lic 



Ca.pilla.ries 



Internal Ccixotid 

 Iiitei-nalju^wli 

 Subcla-via-Ti aj-tery 

 Anbcrior veiiacava. 



Artn 

 ca.pillaries 



Supe,rf iciaJ. 

 ccphaJic ca.pillaji'ics 



E^cternal Ca-rotid 



External j ugular V. 



Com.m.on carotid 

 Brachiocephalic veia 



Palnionarv/ a.rtery 

 PuliTLonai-y vein. 



Lun^ 

 capillaries 



E^.-temal ilac 

 a.rtertj arid vein. 



Posterior vena 

 cava. 



Hepatic veiiT- 

 Hepa-tic portal vein- 

 Liver capillai'ies 



Aiiterior 

 mesenteric ai-tery 



Intestine., 



CapiUa.i-ics 

 Fbstei-i-oi- 

 mesenteric 

 a.rtery 



' Dorsal 

 a-orta. 

 CeJiajC a-rtcry 

 Spleen capillaries 



Ston\acH 



capillaries 

 Rcual aj'teri/ and 

 vein.. 



Kidney 



capillaries 



- Co mrTLoru i li ac 

 artery and vein 



Internal iliaC 

 ai'tery and vein 

 Pelvic 

 capillaries 



Lzg capillaries 



Figure 27.4. The major parts of the cardiovascular system of man as seen in 

 an anterior view. 



pulmocutaneous arches leading to the lungs and skin. New veins, the 

 pulmonary veins, return aerated blood from the lungs to the heart. 

 The heart now receives blood Irom both the body and lungs. Though 

 blood streams from the body and lungs are separated in the frog by a 

 divided atrium, they can, and probably do, mix to a considerable extent 

 in the single ventricle. Ihis mixing is not detrimental to amphibians 

 for some of the blood from the body is returning from the skin where 

 it has been aerated. 



These changes result in a much higher blood pressure in the arteries 



