THE LUNGS 



2O I 



349. The respiratory center. The movements of the 

 chest and diaphragm in breathing are controlled by a 

 small part of the brain situated just above the spinal cord, 

 and called the respiratory center. When it is destroyed, 



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Results of unhealthful dress. 



respiration ceases at once, and no power can arouse it 

 again. 



Stimulation of the nerves of the body which go to the respiratory 

 center may cause it to send out orders for the respiratory muscles to 

 t. Thus, suddenly throwing cold water on the chest will cause a 



