CONTENTS xi 



PAGE 



SECTION V. THE NERVOUS REGULATION OF THE HEART (EX- 

 TRINSIC VENOUS MECHANISM OF THE HEART) - - 156 

 Action of poisons on the heart - 164 

 Normal excitation of cardiac nervous mechanism - - 166 



SECTION VI. THE NERVOUS REGULATION OF THE BLOODVESSELS 



(VASO-MOTOR NERVES) - - 171 



The chief vaso-motor nerves - - - - 173 



Vaso-dilator fibres - - - 177 



Course of the vaso-motor nerves - - - - 179 



Vaso-motor centres - - - - - 180 



Vaso-motor reflexes - - - 183 



Influence of gravity on the circulation - - - 188 



SECTION VII. THE LYMPHATIC CIRCULATION - - - 190 



CHAPTER IV. 

 RESPIRATION. 



SECTION I. PRELIMINARY ANATOMICAL DATA - - -221 



Physiological anatomy of the respiratory apparatus - 222 



Blood-supply of the lungs - - 222 



SECTION II. MECHANICAL PHENOMENA OF EXTERNAL RESPIRA- 

 TION - 224 

 Types of respiration - .... 228 

 Artificial respiration - ... 229 

 Respiratory sounds - ... 230 

 Frequency of respiration ... 233 

 Vital capacity - 235 

 Intrathoracic pressure - 235 

 Respiratory pressure - - 237 



SECTION III. THE CHEMISTRY OF EXTERNAL RESPIRATION - 238 



Inspired and expired air - 238 



Respiratory quotient - - 240 



Ventilation - - 241 

 The quantity of carbon dioxide given off and of oxygen 



absorbed - - 242 



SECTION IV. THE GASES OF THE BLOOD - - 244 



Physical introduction - - 244 



Quantity of the blood-gases - - 249 



Distribution and condition of oxygen in the blood - - 250 



Distribution and condition of carbon dioxide in the blood - 253 



The tension of the blood-gases - 256 



