DIGESTION AND ABSORPTION OF NUTRIENTS 105 



and alcohol in any large quantity often produces serious' 

 disturbances of the organs of digestion. This is especially 

 true when liquors are taken without food ; that is, between 

 meals. The constant danger that the moderate use of beer and 

 the light wines will lead to an uncontrollable thirst for alcohol 

 cannot be emphasized too strongl]/. All authorities agree, too, 

 that the growing youth should let alcohol entirely alone. 



148. Review of Digestion 



Kegion of Alimen- 

 tary Canal 



Kind of Secretion 

 Present 



Processes Carried On 



Mouth cavity. 



Saliva and 

 mucus 



Throat cavity. 



Mucus. 



Mastication of food. 



Starch changed to sugar. 



Sugar and salt dissolved. 



Tasting of food sub- 

 stances. 



Small amount of absorp- 

 tion of water, salt, 

 sugar. 



Passage of food and air. 



Gullet. 



Mucus. 



Passage of food to the 

 stomach. 



