290 DIGESTION, CIRCULATION, AND ABSORPTION 



3. Study Figure 70. What does it show ? 



4. If the cells might be called " citizens," compare with the 

 city of Venice. 



Conclusion. What are some of the changes that take place 

 in the composition of the blood in the tissues ? 



c. The Liver 



Observations. 1. Refer to Figure 63 in Problem XL VII. 

 What have you learned passes through the liver ? Why ? 



2. What are the functions of the liver ? 



Conclusion. What changes then take place in the composi- 

 tion of the blood in the liver ? 



Questions 



1. Explain how the blood feeds the body. 



2. What is the use of lymph vessels ? 



3. How is the food absorbed from the small intestine ? 



4. What is the portal circulation ? 



5. Where does the oxidation of nutrients take place ? 



6. What results when a candle or wood is oxidized ? 



7. What is the function of the lymph ? 



8. What is the function of the lymphatic vessels ? 



9. What vessel drains the lymph from the remainder of the 

 body? 



References 



Hunter, Essentials of Biology. Chap. XXVI. 



Hunter, Elements of Biology. Chap. XXX. 



Davison, The Human Body and Health (Advanced). Chap. XI. 



Eddy, Textbook in General Physiology and Anatomy. 



Hutchison, Applied Physiology. 



