198 Physiology. 



caval 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 pure, the same 



Lung Capillaries 



Pulmonary Vein 



Left Auricle 

 Left Ventricle. 



Aorta___ 



Body Capillaries 



Fig. 86. Plan of Circulation, representing the Right and Left Halves of the Heart sepa- 

 rated, showing that the Blood makes but One Circuit. 



kind that goes to the brain, is sent to the kidneys and to 

 the skin to be purified. Yet, as this mixed blood flows 

 through each organ, that organ, so long as it is in health, 

 takes from it only what it should take. 



