MOTION OF THE HEART AND BLOOD 



but on the basis of difference in function or use. 

 Both veins and arteries were called veins by the 

 ancients, and not unjustly, as Galen notes. The 

 arteries are the vessels carrying blood from the 

 heart to the body, the veins returning blood from 

 the body to the heart, the one the way from the 

 heart, the other toward the heart,^ the latter carry- 

 ing imperfect blood unfit for nourishment, the 

 former perfected, nutritious blood. 



^ In so clearly differentiating the functions of arteries and veins, 

 why didn't Harvey go on and point out the confusion resulting from 

 the terminology in use at the time with regard to the pulmonary 

 vessels? 



72 



