226 



DIGESTION AND ABSORPTION 



fats, pancreatic juice changes them into soft soaps and fatty acids. Fat in this 

 form may be absorbed. (See page 306, Civic Biology.) 



Conclusion. 1. What conditions are necessary to make an 

 emulsion ? 



2. What is the effect of pancreatic fluid on oils? 



Problem 192: To study the effect of artificial pancreatic 

 juice on protein. 



Materials. Artificial pancreatic juice, caustic soda, copper 

 sulphate. 



Method. Using artificial pancreatic juice instead of a mixture 

 of hydrochloric acid and pepsin, carry out an experiment as de- 

 scribed for tube No. 3 of Problem 188. 



Observations. Was any of the white of egg digested? 



Conclusion. Make a table to show the effect of pancreatic 

 juice on nutrients. 



Problem 193 : To find one action of bile. 



Materials. Ox gall or bile, olive oil, parchment paper, funnels. 



Method. Take two funnels, place parchment paper in each. 

 Moisten one paper with bile, the other with water. Then place 

 an equal amount of olive oil in each funnel. 



Observations. Through which funnel does the oil pass more 

 freely? 



Conclusion. What effect might bile have on the wall of the 

 intestine ? 



Summary of the Uses of Human Food Tube and Glands 



DIGESTIVE SYSTEM OF MAN 



( Teeth 

 Mouth < Tongue 



I Glands saliva digests starch 

 Pharynx. 

 Esophagus 

 Stomach glands gastric juice digests proteins dissolves lime salts 



Liver bile helps fat absorption 



1 starch 

 protein 

 oils 

 Absorption of digested foods 



Large intestine slight absorption of soluble foods and wastes 



Alimentary 



Canal 



and 



Digestive 



Glands 



Small intestine glands 



