DIGESTION, CIRCULATION, AND ABSORPTION 271 



d. Stomach. 



e. Intestines. Small and large. 

 2. Assisting glands. 



a. Uses. 



(1) To secrete juices for softening and dissolving food so that 



it may be absorbed into the blood by osmosis. 

 6. Kinds. 



(1) Salivary furnish 



(2) Gastric furnish 



(3) Pancreatic furnish 



(4) Liver furnishes 



(5) Intestinal furnish 



B. EXTRA. 



1 . Special functions of the liver. 



a. A gland to secrete 



?>. A storehouse of 



c. A guardian to destroy _ that otherwise might 



enter the blood. 



PROBLEM XLVI 



How foods are chemically prepared for absorption into 



the blood. 



a. In the Mouth 



1. ACTION OF SALIVA 



Materials. Cornstarch paste, grape sugar (glucose), saliva, 

 test tubes, Fehling's solution, alcohol lamp or Bunsen burner, 

 paraffin wax. 



Method a. Put some corn starch in a test tube of cold water 

 and shake it. Heat it until it boils. Set it aside to cool. 



Observations. 1. Does the starch seem to dissolve in the 

 cold water ? Its color ? 



2. Has the starch that was boiled disappeared from view, 

 or dissolved, or is it still seen ? 



Conclusion. Is starch soluble in cold water? In hot 

 water ? 



Method b. Put some grape sugar in a test tube with water 

 and boil it. Add Fehling's solution and boil it. 



