QUESTIONS 
431 
indigestion or abdominal pain. It is true the sense of pain 
is sometimes abolished by alcohol, and as a result of this 
many a man believes that alcohol aids his digestion, whereas 
it merely exerts a numbing effect on the stomach nerves, and 
his indigestion is disguised rather than removed. In fact, 
instead of being cured the mischief is increased since diges¬ 
tion is retarded. Some digestive medicines contain enough 
alcohol to be injurious. Alcoholic drinks taken with meals 
make the food hard to digest because the alcohol makes the 
food tough. 
SUMMARY 
Man has a definite set of digestive organs that are more 
highly developed than those of any other animal. These 
digestive organs prepare proteins, carbohydrates, and fats 
so that they pass into the blood. The blood is forced by 
the heart through definite blood vessels. The study of food 
is important because we require food in order to live. The 
cost of food and the amount needed are problems that 
science is helping to solve. 
QUESTIONS 
What do man and other animals require in order to grow? Name 
the kinds of foods. What is the value of protein? Of carbohydrates? 
What is a calorie? What are food substitutes? Name several ways 
in which the supply of food can be increased. What does cooking do to 
foods? Why is this important? What is digestion? What is indiges¬ 
tion? Absorption? How are the cells of the body fed? 
