242 



PLAN OF CIRCULATION. 



the same with the brain. In the skin and the kidneys the 

 blood has great losses and little gains. 



The accompanying diagrams may help in presenting the 



Capillaries 



Vein 



Artery 



Artery 



-Vein 



Capillaries 



Fig. 72. Diagram of the Heart and Blood Tubes. 

 (Dorsal View.) 



main points in the blood circuit, and the losses and gains in 

 its course. 



In the common blood streams are combined the good and 

 the bad. The newly digested food is received into a current 

 of impure blood returning from the muscles (Caval Veins). 



