RESPIRATION OF THE TISSUES 2 19 



92. Show a fish's gills and if possible a tadpole's also. Wigglers, 

 the young of mosquitoes, can be found in rain barrels, and are very 

 interesting. Each wiggler has a breathing tube near the hinder part 

 of its body. The insects wiggle about in the water and at intervals 

 come to the surface and thrust their breathing tubes above the surface 

 to get oxygen directly from -the air. 



REVIEW TOPICS 



1. Give the changes occurring in the air within the lungs. 



2. Give the changes which occur in the blood within the 



lungs. 



3. Show that the blood carries oxygen. 



4. Show that the skin and stomach are respiratory organs. 



5. Show that the cells of the body take oxygen and give 



off carbonic acid gas. 



6. Show that the blood carries carbonic acid gas. 



7. Show that respiration is a rapid and continuous 



process. 



8. Calculate how much oxygen is used daily and how 



much carbonic acid gas is given off. 



9. Show why a person becomes long winded by training. 

 10. Give some causes of shortness of breath. 



n. Tell when and why inhalations of pure oxygen are of 

 benefit. 



12. Give the effects of alcohol upon the walls of the air 



sacs. 



13. Show how alcohol affects the respiration of the cells. 



14. Show how alcohol causes poisons to develop within the 



body. 



15. Give the effects of tobacco upon the air passages. 



16. Show how respiration is modified in birds, in fish, in 



frogs, in insects, and in shellfish. 



17. Explain the respiration of plants. 



