CIRCULATION 



241 



falls, but the fall is not steady. Often it is interrupted by a 



more or less marked increase corresponding to the later part of 



A s. v. s. 



AS. 



FIG. 116. Diagram to show the relationship of the events in the Cardiac Cycle to 

 one another. A. S., auricular systole ; F'.S., ventricular systole ; P., pause. 



the ventricular contraction. At the moment of ventricular 

 diastole, the fall is very sharp and is interrupted by a well- 



16 



