CHAPTER VII 



HOW JACK'S HOUSE EXTRACTS BUILDING MATERIALS 

 FROM FOOD STOMACH AND INTESTINAL DIGESTION 



WHEN food is swallowed, it passes quickly down 

 through a tube called the esophagus into the stomach. 



The esophagus is di- 

 rectly behind another 

 tube, the trachea, com- 

 monly called the wind- 

 pipe, through which air 

 passes to our lungs. 

 (See cut.) An intro- 

 duction to the stom- 

 ach is hardly necessary, 

 intestine F rom babyhood we have 

 heard it spoken of as 

 full or empty, and have 

 known that it has to 

 do with the food we 



Alimentary Canal. eat. Perhaps Some 



may have even learned 



that when unwholesome foods get into the stomach, 

 pain results. The cut gives a good idea of the 

 stomach's shape, size, and position in the abdomen. 



22 



Ouod 



rt Small 



Vermiform . 

 Appendix 



