Manner in which Nourishing Fluids are Sent to the 



Tissues. 



The Circulation 



I. General Considerations 



II. The Heart . 

 A. Structure 

 Relations 

 Physiology 



I. The Cardiac Cycle- 



(A) Frog 



(B) Mammal . 



B. 



a 



of the Chambers 



Rate . 



Sequence of Events 



Duration of Phases 



Changes in the Shape 



The Cardiac Impulse. 



Changes in Intracardiac Pressure 



Action of the Valves 



The Flow of Blood through the Heart 



Sounds of the Heart . 



II. The Work of the Heart 

 III. The Influence of the Central Nervous System 



IV. The Maintenance and Control of Cardiac Rhythm 



1. The Initiation of Contraction 



2. The Conduction of Contraction 



V. The Nature of Cardiac Contraction 



III. Circulation in the Blood and Lymph Vessels 



1. Structure ..... 



2. Physiology ..... 



A. Blood Pressure .... 



1. General Distribution of Pressure . 



2. Rhythmic Variations of Pressure . 



382 



384 

 384 

 393 

 393 



393 

 394 

 394 

 39.5 

 396 

 397 

 398 

 399 

 402 

 404 

 407 

 410 



418 



424 

 424 

 427 



427 



431 

 431 

 432 

 432 

 432 

 434 



