LESSON XXVI 



RESPIRATION 



MECHANICS OF RESPIRATION 



1. The Spirometer. Study the construction of the spirometer 

 (Hutchinson) . Breathe normally, then close the nostrils and exhale 

 normally through the mouthpiece of this instrument. Determine the 

 movement of the pointer and calculate the volume of the tidal air. 



FIG. 86. WINTRICH'S MODIFICATION OF HUTCHINSON'S SPIBOMETER. (Reichert.) 



Breathe normally; then exhale forcibly through the mouthpiece. 

 Determine the volume of the supplemental air. 



Set the spirometer at 5000 c.c. Breathe normally ; then inspire deeply 

 through the mouthpiece. Determine the volume of the complemental 



air. 



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