THE INTESTINES AND INTESTINAL DIGESTION III 



STTMMARY OF THE PROCESS OF DIGESTION. 



Solution commenced in the mouth by the saliva. 



Continued in the stomach by the swallowed saliva. 



Completed in the intestines by the intestinal juices. 



Solution commenced in the stomach by the gastric 

 fluid. 



Continued in the intestines by the gastric fluid which 

 has passed through the pylorus, by the pancreatic 

 fluid, and also (probably) by the intestinal secre- 

 tions. 



Fat globules loosened from their nitrogenous cell-walls 

 and membranes by the gastric fluid. 



Digested in the intestines by the bile and the pan- 

 creatic fluid. 



Dissolved by the various digestive fluids. 



Bt&rchy foods . . 

 Nitrogenous foods . 



Fats 



Mineral salts . . 



QUESTIONS ON LESSON XIX. 



1. Describe the structure of the intestines. 



2. In what respects does the mucous membrane of the intestines differ from 



that of the stomach ? 



3. What are the valvula conniventes ? What are their uses ? 



4. Describe the general form and position of the pancreas. What is the 



nature of the fluid which it secretes ? 



5. Describe the action of the pancreatic fluid on various kinds of foods. 



6. What are the general properties of the bile ? Where is it prepared ? 



Where does it enter the alimentary canal ? 



7. What are the uses of the bile ? 



8. What is chyme ? Of what does it consist ? Describe the changes which 



take place during its formation. 



9. In what part of the abdomen does the small intestine communicate with 



the large intestine ? How do they join ? What is the condition of the 

 contents of the small intestine just before passing into the large intes- 

 tine? 

 to. What changes does the food undergo in the large intestine ? 



11. Describe the nature of the food materials in a beef-steak pudding. 



Where are these materials digested ? Name the fluid or fluids con- 

 cerned in the digestion of each. 



12. Describe the action of the gastric fluid, the pancreatic fluid, and the 



bile, respectively, on fatty tissue. 



LESSON XX. 



ABSORPTION. 



THE object of the present lesson is to show how the nutritious 

 matter derived from the food during the process of digestion 

 enters into the blood system. 



Food is taken in order to repair the waste which is continually 



