284 THE ENGINES OF THE HUMAN BODY 



Throat, involuntary movements of, 163. 



mechanism of, 175. 

 Throttle-valve, 11. 

 "Throttle-valve" of muscles, 38. 

 Throttle-valves of body, 153. 

 Thyroid gland, 224, 226. 



secretion, effects on combustion, 154. 

 Tidal air, 141. 

 Timing of muscles, 17, 



systems, 220. 

 Tired muscles, 18. 

 Tissues, nourishment of, 108. 

 Tongue, 163. 



actions of, 165, 169. 

 Toothache, 169. 

 "Touch-button" machinery, 180, 248. 



mechanism of rectum, 218. 

 of throat, 175. 



telephone mechanism, 253. 

 Toxin formation, 211. 

 Trachea or windpipe, 93, 121, 136, 

 Transmitters explained, 254. 



in muscles, 43. 



or end organs, 175. 

 Transmitting stations of mouth, 169. 

 Transport in intestines, 202. 



system, 159. 

 'Transverse processes, 23. 

 Triceps muscle, 41. 

 Trochanters of femur, 72. 

 1 ' Trunk " calls to the brain, 159, 261. 

 Trypsin, 198. 



Tubular boiler, exemplified, 204. 

 Two-cycle engine, 30. 



Unborn child, 70. 



Upright posture (see Erect Posture). 



Urea, formation of, 201. 



Vagus nerve, 241. 

 Valve trouble, 271. 

 Valves of engine, it. 



of heart, 99. 



of pump, 109. 



of veins, 97. 

 Vaso-motor mechanism, 115. 

 of bowel, 204. 



system, 226. 

 Veins, 91. 



Veins as exhaust pipes, 29. 

 Ventricle, left, as pump, 103, 109. 

 Ventricles of heart, capacity of, 105. 

 Vertebra, parts of, 54. 

 Vertebrre, 22. 



first and second, 55. 

 Vestigeal structures, nature of, 213. 

 Villi of intestine, 204. 

 Viscera in diaphragmatic piston, 131. 



support of, 129. 

 Vision, 232. 

 Visual cortex, 238. 

 Vital capacity of lungs, 141. 



spirits, 93. 

 Vocal cords, 136. 

 Voice, training of, 41. 

 Vomiting, mechanism of, 192. 



Walking, action of backbone in, 21. 



joints involved, 82. 



mechanism of, 14, 16. 



nerve mechanism of, 253. 



racial gait in, 60. 

 Waller, Dr Augustus, 248. 

 Warfare between cells, 73. 

 Warming chambers, 134. 

 Warning-horn of human machine, 136. 

 Water, discovery of composition of, 149. 



passage of, in the stomach, 183. 

 Water-taps, 115. 

 Weight of bones and muscles. 89. 



of left ventricle, no. 



of muscles of adult man, 26. 

 Wheel, nature of, 14. 

 Wheels compared to limbs, 26. 

 Wind in alimentary system, 216. 

 Windpipe (see Trachea). 

 Wireless installation, 266. 

 Woman, brain of, 235. 

 Work (see also Exercise). 



food transformed into, 160. 



fuel and oxygen needed for, 113. 

 Wounds, repair of, 269, 273. 

 Wrist, fixation of, 68. 

 Writer's cramp, 68. 

 Writing, muscles concerned in, 40. 



X-ray examination, 170. 



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