THE USE OP FOOD 



causing food to pass on its way. The food tube also helps 

 to break up the food through the churning of its muscles. 

 The end results are that the food which passes into the 

 mouth in solid form is gradually broken up and then made 

 soluble by means of enzymes formed in the glands in 

 different parts of the food tube. The wall of the tube 

 is filled with tiny blood vessels, and in the small intestine 

 there are numerous tiny projections into which these 

 tiny blood vessels pass. As the food 

 becomes soluble, it is absorbed 

 through these projections and gets 

 into the blood and thus ultimately 

 gets to the cells. 



Demonstration 4. How Food Is Prepared ' _panctSttic|..~ 



for Digestion. juice, 



Cut a half-inch cube from a hard-boiled 

 egg and place it in a test tube with a 

 small amount of artificial pancreatic juice. 

 Take a second cube of the same size and 

 mince it. Place this in a second test tube 



with an equal amount of artificial pancreatic juice. Place the 

 two test tubes in warm water and leave for half an hour. What 

 has happened in each of the tubes ? How do you explain this ? 



If enzymes are to do their work properly, then food 

 must come in contact with them. If the food is chewed 

 into small particles, a greater amount of surface will be 

 exposed to the enzyme and digestion will then take place 

 more rapidly. This shows the reason for chewing food. 



Our teeth are well fitted for this 

 purpose ; some are sharp and are 

 used for cutting and others have 

 broad surfaces used for grinding. 

 Care of the Teeth. Thorough 

 chewing of the food is necessary 

 for good health. Many of us bolt 



What is the object of chewing & 



food? our food, and as a result suffer 



