408 FOODS CIRCULATED AND USED IN THE BODY 



are closed. If this condition continues for any length of time, the 

 nose and throat should be examined by a physician for adenoids, 

 growths of soft masses of tissue which fill up the nose cavity and 

 prevent normal breathing. Many a child, backward at school, 

 thin and irritable, has been changed to a health}', normal child, 

 by the removal of adenoids. Sometimes the tonsils, at the back 

 of the mouth cavity, become diseased and enlarged, causing 

 serious throat troubles and sometimes acute rheumatism and 

 heart disease. 



Relation to health. We all know that exercise in moderation 

 has a beneficial effect upon the human organism. Exercise, 

 besides training the muscles, increases the activity of the heart 

 and lungs, causing deeper breathing and giving the heart muscles 

 increased work ; it liberates heat and carbon dioxide from the 

 tissues where the work is taking place, thus increasing the respi- 

 ration of the tissues themselves, and aids mechanically in the 

 removal of wastes from tissues. Exercise is of immense impor- 

 tance to the nervous system as a means of rest. 



Demonstration 5. To show the prone-pressure method of artificial 

 respiration. 



Place the person face downward with his head turned to the side 

 and supported on his arm. Kneel astride him at the bend of his 

 knees and slowly but strongly press down and forward with the 

 hands, keeping the arms straight, immediately over the lower part of 

 the chest cavity. Hold this pressure for about three seconds and 

 then swing the weight of the body off suddenly, thus allowing the 

 lungs of the subject to fill with ah. After two seconds repeat the 

 pressure as before. Count the seconds as you perform this operation 

 so as to make the total number of respiratory movements twelve 

 to the minute. 



Why time these movements twelve to the minute? "Why press 

 down on the ribs? vThat structures play a part when this is done? 



Suffocation and artificial respiration. Suffocation results when 

 the supply of oxygen is shut off from the lungs. It may be brought 

 about by an obstruction in the windpipe, by a lack of oxygen in 

 the air, due to inhaling some other gas in quantity, by drowning, 

 or from a severe electric shock. In any one of the above cases, the 

 person's life may be saved by prompt recourse to artificial respira- 

 tion. The prone-pressure method is considered one of the best. 



