158 



ANIMAL BIOLOGY 



were, around the liver so that they do not directly enter the blood 

 supply to that organ. (Fig. 115.) 



Superior vena cava 



Thoracic duct 



Left jugular vein 



Left subclavian vein 



Receptaculum chyli 



from Stomach 



Lacteals or 



lymph vessels 



in lumbar regions 



Intestine 



Fig. 115. - - A, diagram of paths of absorbed food from the human digestive 

 tract. Proteins and carbohydrates by veins; fats by lymphatics. B, plan of 

 distribution of the chief lymphatic vessels in the human body. 



D. Large Intestine 



During the passage of food through the small intestine, digestion 

 is practically completed and absorption has progressed far. The 

 remaining material is carried through a constriction into the 

 large intestine, or colon, where the activities of Bacteria bring 

 about various chemical changes apparently incidental to the slow 

 passage of the residue. Furthermore, water is gradually absorbed 



- water that up to this point has been necessary to keep the ma- 

 terials fluid to facilitate digestion. Then the useless undigested 



