142 DIGESTION AND ABSORPTION 



4. Locate four sphincters and discuss tlie importance of each. 



5. Plan an experiment which will illustrate the digestion of 

 starch. 



6. Name three intermediate and three end products in the digestion 

 of nutrients. 



7. Discuss the importance of the villi in absorption. 



8. Give two classes of cathartics or laxatives. After reading the 

 labels of two or three common cathartics, state to which class each 

 belongs. 



9. Name an unhygienic condition that is frequently found among 

 high school students and which may lead to digestive disorders. 



10. What is the objection to reading and eating at the same time ? 



11. Name two scientists who have investigated food habits. Dis- 

 cuss their contributions to the science of nutrition. 



12. Review and report on the digestion and osmosis experiments 

 set up in elementary science. 



Supplementary Readings 



Haggard, H. W., Science of Health and Disease (Harper & Brothers). 

 Kimber and Gray, Textbook of Anatomy and Physiology (The Macmillan Co.). 



