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THE HUMAN BODY. 



Divisions of the canal, 



f In the canal 



Digestive 

 glands, 



Mouth (containing teeth and tongue). 



Throat. 



Gullet. 



Stomach. 



Small intestine. 



Large intestine. 



Stomach glands, making gastric juice. 



Intestinal glands, making intestinal juice. 



Outside the 

 canal . 



making sa- 

 liva. 



Parotid, 1 



Salivary glands, \ Submaxillary, I 



Subliiigual, J 



Liver, making glycogen and bile. 

 Pancreas, making pancreatic juice. 



ABSORPTION. 



SECTION II. 1, The alimentary canal may be likened 

 to the kitchen in which the food is prepared. The blood 

 is the carrier, swiftly moving through the passage-ways, 

 and serving every room in the house of life. 



2, Through the whole length of the canal, its wall is 

 filled with meshes of hair-like blood-vessels, completely 

 surrounding it, like a net-work, ready to soak up the food 

 through their thin walls just as fast as it is made ready. 

 Through these little vessels the current is moving, so that 

 fresh blood is continually taking the place of that which 

 has just passed on with its load. 



3. Let us follow a mouthful of food, consisting of bread 

 and meat, from its entrance between the lips into the 

 canal. First the teeth cut and grind it, the tongue and 

 cheeks skillfully turning and shifting it from side to side, 

 the saliva, meantime, wetting and partly dissolving it. 

 When it is fine and soft enough, the tongue forces it 

 against the roof of the mouth, and so slips it back to the 

 throat. Certain muscles then contract, and lift the throat 

 up around it. It is clasped and pushed down by the con- 



