RESPIRATION AND THE VOICE. 141 



ing? What change takes place in the chest? Why does the air 

 enter it ? W T hat is the chest like ? 



3, In what two ways is the chest made larger ? Describe the first- 

 named way. 



4, Describe the second-named way. 



5, Why do the lungs enlarge when the chest does? 



6, What are the pleurae? 



7, Describe briefly the process of breathing. 



8, Does the will have any thing to do with ordinary breathing? 



SECTION V. 1. Follow the course of oxygen as it enters the 

 blood. 



2, What change in the color of the blood takes place? Where 

 does the change from red to blue take place? Where does the 

 change from blue to red take place? 



3, What is the cause of the change in color? 



4, What is the work of the blood? 



SECTION VI. 1, 2, What do the lungs do besides taking in 

 oxygen? What waste products are discharged by the lungs? 



3. How much air is there in a breath? How much air do we 

 breathe in a day? 



4. What four changes take place in every breath? Has it lost all 

 its oxygen? How much oxygen must air contain to support life? 

 How small a loss of oxygen will be felt ? 



5. Do we breathe the same air a second time? 



7. What are the immediate effects of lack of fresh air? 



8, How should we try to secure fresh air ? 



SECTION VII. 1. What are the organs of voice? 



2, How are the organs of voice like a reed-pipe? and what part 

 does each do? What is the glottis? What are the vocal cords? 



3, What resemblance between the vocal organs and a reed-organ? 



4, How should the voice be cultivated ? 



SECTION VIII. 1, What is the effect of alcohol on the breath ? 

 2, 3, What is the effect of tobacco on the breath ? 



