196 



PHYSIOLOGY. 



The accompanying diagrams may help in presenting 

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

 gains in its course. 



Blood a Mixture of Good and Bad. In the common 

 blood streams are combined the good and the bad. The 



Capillaries 



Vein 



Artery 



Artery 



Vein 



Capillaries 

 Fig. 71. Diagram of the Heart and Blood Tubes (Dorsal View). 



newly digested food is received into a current of impure 

 blood in the postcaval vein. The blood from the kidneys, 

 probably the purest blood in the body, joins the same 

 impure stream. From the aorta, red blood, usually called 



