146 PATHOLOGY 



organ increases in size through the increase in size or 

 multiplication of its elemental cells. Thus the structure 

 of the hypertrophied tissue does not differ materially 

 from normal tissue. 



Simple hypertrophy is due to an increase in size of the 

 individual cells of the organ, and is exemplified in the 

 hypertrophy of the pregnant uterus and in compensatory 

 hypertrophy of the heart. 



Hyperplasia or numeric hypertrophy consists of an 

 increase in the number, but not in the size, of the indi- 

 vidual cells composing an organ or tissue. 



