418 FOODS CIRCULATED AXD USED IX THE BODY 



VIII. Ventilation (36) is necessary in order to raise the temperature 

 of a room; (37) removes carbon dioxide and renews oxygen; (3S) is 

 necessary because moving ah' helps to keep a room more comfortable : 

 (39) removes moisture, heat, carbon dioxide, and other products of 

 respiration and renews the supply of oxygen : ^40) is best brought 

 about in sleeping rooms by having the windows open top and bottom. 



IX. Body wastes are removed (41) from the cells by the blood 

 which carries the organic wastes to the kidneys : (42) from the kidneys 



in the form of urea : (43) in a gaseous state : 44; from the body by 

 the kidneys: (45) best by taking cathartics. 



X. The skin (46) regulates body heat : (47) furnishes protection 

 against germ- : 4 8 is an organ of excretion : (49) contains millions 

 of sweat glands under nervous control ; (50) should be kept warm if 

 one has a cold, for this keeps blood from the internal organs and thus 

 prevents congestion. 



Achievement Test 



1. What do blood corpuscles look like under the compound micro- 

 scope ? 



2. How would you demonstrate the capillary circulation in the web 

 of the frog's foot ? 



3. How would you make a tourniquet and what would you do 

 in case of an accident where loss of blood occurs? 



4. Why is blood transfusion not possible between some people and 

 possible between others ? 



5. What are the endocrine glands and what is the function of 

 each? 



6. How could you make a diagram of circulation of blood in your 

 own body? 



7. How can you prove that you oxidize materials (food or tissues"' 

 in your own body'? 



8. How can you demonstrate the prone-pressure method of arti- 

 ficial respiration? 



9. How can you demonstrate the best method of ventilating a 

 room and show why it is the best method? Do you practice this in 

 your sleeping room ? 



10. How could you demonstrate the changes that take place in 

 air in vour lungs ? 



