THE BLOOD AND ITS CIRCULATION 



blood through the left ventricle, then through the arteries, 

 capillaries and veins, and then to the lungs and back to 

 the left ventricle. 

 All the blood in 

 the body passes 

 through the heart 

 every two min- 

 utes. 



120. Venous 

 and arterial blood. 

 In the lungs 

 the blood from 

 the veins be- 

 comes of a 

 bjrj 2Lb^e-r red 

 color. It goes 

 back to the heart 

 and is sent out 

 again by the ar- 

 teries. The blood 

 going to the cells 

 of the body is of 

 a bright red color 

 and is called ar- 

 terial blood. The 

 blood as it comes 

 from the cells is 

 darker in color 

 and is called ve-. 

 nous blood. Ve- 

 nous blood is not 



bad blood, but the change is due merely to the decrease 

 in the amount of air in the blood, 

 ov. PHYSIOL. (INTER.) 5 



Diagram of the course of the blood in the circulation. 



