xvi CONTENTS 



PACE 



(a) Changes Synchronous with the Heart Beats— 



1. The Arterial Pulse . . . 434 



2. The Capillary Pulse . . .444 



3. The Venous Pulse . . . 444 



(b) Changes Synchronous with Respirations — 



1. Arterial .... 446 



2. Venous .... 447 

 3. The Mean Blood Pressure .... 447 



I. Pressure in the Arteries — 



(1.) Methods of Determining . . 447 



(2.) Normal Pressure . . . 449 



(3.) Factors Controlling . . . 450 



i. Heart's Action . . . 451 



ii. Perijiheral Resistance — Condition 



of the Arteries . . .451 



1. Method of Investigating . 452 



2. Normal State . . . 453 



3. Nervous Control . . 454 



Vaso-Constrictor . . 455 



Vaso-Dilator . . . 458 



II. Pressure in the Capillaries . . . 460 



III. Pressure in the Veins . . . 463 



IV. Pressure in the Lymphatics . . . 464 



B. Flow of Blood . . ' . . . .464 



1. Velocity ...... 465 



2. Special Characters .... 467 



C. Special Characters of Circulation in Certain Situations 468 



D. Extra-Cardiac Factors Maintaining the Circulation . 470 



1. Movements of Respiration . . . 470 



2. Intermittent Muscular Exercise . . . 470 



E. Influence of Posture on the Circulation . . 471 



F. Fainting ...... 472 



Ct. Time taken Ijy the Circulation . . . 472 



H. Flow of Blood through Different Organs . . 473 



SECTION V. 



Fluids Carrying Nourishment to the Tissues. 



Blood and Lymph. 



A. Blood ........ 474 



I. General Characters ...... 474 



II. Clotting . . . . . . .475 



III. Plasma and Serum ...... 479 



