FUNCTIONS OF ANIMAL ORGANISMS 



459 



Dissimilation 



Tissues 



Assimilation 



/. 



Digestion 



Animal 



Organism 



Deatfi 

 Elimination 



Expiration 



Bacterial 

 Decay 



V 



Food 



Proteins, Fats, 

 Carbohydrates in 

 Plants 



\ 

 Photosynthesis 



in Plants 



■CO2 

 Air £r Water 



Fig. 297. — Diagrams to illustrate the carbon cycle in organisms. The steps above 

 the line of dashes occur in the animal organism, those below outside of it and in part in 

 plants. 



Dissimilation 



Tissues 



Assimilation 



Digestion 



J 



Food 



An I ma J 

 Organism 



Nitrogenous 

 Wastes(Urea) 



\ 



Death 



Voteins 



\ 



Photosynthesis 

 in Plants 

 \ 

 Nitrates 



N of Air, 



I 



Nitrogen 



Fixing 



Bacteria 



Bacterial Action in 

 Soil &- Water 



Eiiminafion 



'x Bacterial Decay 



Denitrifying / / 



Bacteria Ammonia 



/ / 



Nitrite Bacteria 



/ 



Nitrites 



Fig. 298. — Diagram to illustrate the nitroKen cycle related to organisms and their activities. 

 The steps above the line of dashes take place in animal organisms. 



