THE VERTEBRATE BODY 



339 



ber that this is an erythrocyte, or red blood cell, and we have just wit- 

 nessed the diffusion of oxygen from this cell into the oxygen-hungry 

 surrounding tissues. 



We also see irregular-shaped bodies that sometimes contain lobed 

 nuclei. These are rapidly accumulating around the break in the capil- 



\ 



\ V\ *i Left auricle 



.-, '. \\}\ Truncus arteriosus/ 



Right auricle 

 Ventricle 



External carotid 

 Internal carotid 

 Carotid 



Pulmocutaneous 

 '-—Pulmonary 

 Brachial 



h — Systematic arch 



Coeliaco-mesenteric 

 (to stomach, pancreas, 

 spleen, and intestine 



r-Spermafic 

 Renal 



Dorsal aorta 



Iliac 



Sciatic 



Fig. 23.8. The heart and principal arteries of the frog. 



lary through which we entered. We noticed several objects have entered 

 this abrasion along with us that appear as bunches of huge grapes. 

 There is one of these clusters floating just in front of us, but one of the 

 multi-nucleated bodies approaches and throws broad pseudopodia out 

 around it like the tentacles of an octopus. These tentacles close in and 

 snap together and we now see the foreign cluster inside the huge cell. 



