CIRCULATION OF THE BLOOD. 



pressure. Mv is a manometer connected with a vein to show 

 changes in venous pressure. The glass, containing water, repre- 

 sents the auricle ; the bulb of the syringe, the ventricle. The in- 



FIG. 33. Artificial Schema of the Circulation. (Description in text.) 



crease in resistance in the circulation that occurs in the capillary 

 area is imitated by screw clamps on the tubing. The resistance 

 may be increased by screwing the clamps more tightly, and de- 



