196 RESPIRATION, BLOOD, AND EXCRETION 



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we walk out-of-doors, we should take plenty of fresh air 

 into our lungs in a series of deep breaths. All young 

 people should take exercise in the open air, because such 

 exercise develops all the organs and makes them strong. 

 Thus the whole body becomes more robust and better able 



to withstand disease and 

 to do its work. 



Suffocation. — When 

 the body is deprived of 

 a sufficient supply of 

 oxygen, suffocation re- 

 sults. This is what 

 happens in drowning or 

 when the windpipe be- 

 comes closed. 



In many cases a per- 

 son who is suffocating 

 may be saved through 

 artificial respiration. 

 This is the name given 

 to a series of movements 

 which are used to restore 

 natural breathing. The 

 simplest method is to 

 place the patient on his 

 back, with the head 

 lower than the hips. 

 Then raise the arms upward and outward until they come 

 together above the head. This movement enlarges the 

 chest cavity and helps to draw air into the lungs. The 

 air is forced out of the lungs by bringing the arms back to 

 the side of the body and pressing gently against the 

 sides of the chest. This series of movements should be 

 repeated gently every few seconds, and may have to 



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Figure 209. — Hot-air Heating. 

 By Earl Hallenbeck. 



