218 



GENERAL BIOLOGY 



bended in the word metabolism, and their relation to the 

 accessory phenomena are indicated in the following table: 



METABOLISM 



Food intake 

 Digestion 

 Circulation 

 of food from the 



alimentary canal 

 of oxygen from 

 the lungs 



Assimilation (Ana- 



bolism) 

 Dissimilation 



(K diabolism) 



Circulation 



ofCO 2 and HO 

 to the lungs 

 of H 2 O and N 

 waste to kidneys 



Discharge of waste 



Accessory processes, 

 mechanical and 

 chemical 



The essential pro- 

 cesses : 



the work of every 

 cell 



Accessory processes, 

 mechanical and 

 chemical 



Common features of organization in plants and animals: 



1. Protoplasm is the "physical basis of life," and in 

 nearly all organisms it is definitely organized into cells. 



2. Cells, therefore, are the units of organic structure. 



3. The method of increase is by cell division. 



4. Every organism begins life as a single cell. 



5. Aggregates of cells may form individuals of a higher 

 order, with the various parts of the cell complex fitted toge- 

 ther in a state of mutual dependence. 



6. Two processes are therefore involved in the making 

 of such organisms: i) cell division and 2) cell differentiation. 



