134 



LABORATORY GUIDE IN PHYSIOLOGY. 



(2) In what position is the diaphragm during these 

 two phases of respiration ? 



(3) What parts of the diaphragm make the greatest 

 change of position during inspiration ? 



(4) What causes the diaphragm to arch anteriorly 

 during normal expiration? Are the conditions 

 changed during the present observations? 



kldlPlfX.. 



FIG. 22. 



(5) Are the diaphragmatic movements synchronous 

 with the costal movements? 



b. The normal phrenogram. 



(6) Take a phrenogram. What may be learned 

 from it? 



(7) Without varying the adjustment of the phreno- 

 graph bulb, take a tracing while repeatedly inter* 



