CONTENTS xi 



PAGE 



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

 TRINSIC NERVOUS MECHANISM OF THE HEART) - - 156 

 Action of poisons on the heart - 166 

 Normal excitation of cardiac nervous mechanism - - 168 



SECTION VI. THE NERVOUS REGULATION OF THE BLOODVESSELS 



(VASO-MOTOR NERVES) - 173 



The chief vaso-motor nerves - - - - - 175 



Vaso-dilator fibres - - - - - 179 



Course of the vaso-motor nerves - - - :8i 



Vaso-motor centres - - - 182 



Vaso-motor reflexes - - 185 

 Influence of gravity on the circulation - - -190 



SECTION VII. THE LYMPHATIC CIRCULATION - - 192 



CHAPTER IV. 

 RESPIRATION. 



SECTION I. PRELIMINARY ANATOMICAL DATA 22* 



Physiological anatomy of the respiratory apparatus - - 223 



Blood-supply of the lungs - - 223 



SECTION II. MECHANICAL PHENOMENA 'OF EXTERNAL RFSPIRA- 



TION - 225 



Types of respiration -...-- 229 



Artificial respiration -----_ 230 



Respiratory sounds - - - - - -231 



Frequency of respiration - - - 234 



Vital capacity - - - 236 

 The dead space - - - - - -236 



Intrathoracic pressure ..... 236 



Respiratory pressure - - - - - -238 



SECTION III. THE CHEMISTRY OF EXTERNAL RESPIRATION - 239 



Inspired and expired air - - - 239 



Alveolar air ~ - - - - 241 



Respiratory quotient - - - - - -241 



Ventilation - - - 242 

 The quantity of carbon dioxide given off and cf oxygen 



absorbed - - - 243 



SECTION IV. THE GASES OF THE BLOOD - - - 245 



Physical introduction - - - 245 



Quantity of the blood-gases - - 250 



Distribution and condition of oxygen in the blood - - 252 



Distribution and condition of carbon dioxide in the blood - 255 



The tension of the blood-gases - 258 



Mechanism of the gaseous exchange in the lungs - - 263 



