286 DIGESTION, CIRCULATION, AND ABSORPTION 



3. Where does the right side of the heart send the blood ? 

 The left ? 



4. How do arteries end ? Veins begin ? 



5. Do you find any special blood tubes running to tho 

 liver? Note. Much digested food absorbed from the small 

 intestine must pass through the liver before it reaches the 

 heart. Many impurities are taken out in the liver. 



Conclusion. Trace the general circulation of the blood. 



d. The Circulatory System 



Observations. 1. Try to fill in the following outline : 

 I. General function of circulation. 

 II. Materials carried, their sources and destinations : 



III. Constituents of the blood, with their special functions 

 (Report in tabular form.) 



1. Plasma, 

 a. 



b. 

 c. 



2. Corpuscles, 

 a. 



b. 



IV. The circulatory apparatus and functions. 

 1. The heart. 



