88 



SPECIAL PHYSIOLOGY 



stand at the same lever? If not, why? What allowance, if any, 

 should be made for this? 



3. Observations. (1) By experiment fill out the following table: 



(2) Trace the pulse upon the kymograph as indicated in the 

 foregoing lesson. 



(3) What are the principal factors which control blood pressure? 



(4) State concisely just what effect these factors have upon blood 

 pressure. 



(5) What combination of conditions yield the highest arterial 

 pressure ? 



(6) What set of conditions yield the lowest arterial pressure? 

 The highest venous pressure? The lowest venous pressure? 



VI. THE EADIAL PULSE AND THE SPHYGMOGRAM. 



1. Appliances. A sphygmograph; tracing slips; a fish-tail gas 

 jet or kerosene lamp, and a holder in which to place the slips while 

 they are being smoked (Fig. 50). 



FIG. 50 



Holder for smoking slips for the Dudgeon sphygmograph. 



2. Preparation. That the sphygmograph is so little used by the 

 general practitioner may be attributed to the fact that hurry of 

 business or some other cause has hindered him from making himself 

 thoroughly conversant with the adjustment and use of the instrument, 

 with its limitations and with the interpretation of the tracings. 



