312 



ELEMENTS OF PHYSIOLOGY 



Hearing, 255 



Heart, 10, 12, 21 ; force-pump action 

 of, 140 ff . ; valves of, 141 ; regula- 

 tion of, 159 ; nerves of, 160 



Heart beat, 139 



Heat, produced in working muscles, 

 52 ; effect of, on the circulation of 

 the blood, 152 ; production and 

 transfer of, 194, 204 ; transfer of, 

 from internal organs to the skin, 

 212; unit of, 216; supply of en- 

 ergy for production of, 220 



Heat balance, 199 ff . 



Heating foods, 220 



Hemoglobin, 137, 138, 167 



Hepatic artery, 24 (fig.) 



Hepatic vein, 24 (fig.), 26 



Hindbrain, 264 



Hip bones, 19 



Hoarseness, 21 



Hormones, 89 



Horny layer of skin, 185 



Humerus, 19 



Humidity, influence on temperature 

 regulation, 200 ; influence on men- 

 tal work, 207 



Hunger, 261 



Hypermetropia, 248, 250 



Ileocolic sphincter, 128 

 Illumination for near work, 251 

 Illusions, optical, 254 

 Indigestible material in food, 97 

 Indigestion, 114, 132 ff. 

 Inhibition, 160, 296 ; in the nervous 



system, 281 



Inhibitory nerves of heart, 160 

 Inorganic salts. See Salts 

 Instep, bones of, 19 

 Interdependence of organs, 63 

 Internal secretion, 64 

 Intestinal juice, 118-121 

 Intestinal waste, elimination of, 



132 

 Intestine, small, 10, 20, 23 (fig.), 25, 



117 ; large, 10, 20, 127 ; action of 



muscular coat of, 122, 128 

 Iris, 243, 244 (fig.), 247 (fig.) 

 Irritability, 45 



Jugular vein, 23 (fig.) 



Kidneys, 10, 13, 14 (fig.), 23, 25; 



structure of, 181 ff. 

 Kilogrammeter, 216 



Labyrinth of ear, 256-258 



Lactic acid, 48, 59 



Large intestine. See Intestine 



Larynx, 20 



Lateral costal breathing, 173 



Lens of eye, 243, 247 (fig.) ; forma- 

 tion of image by, 244 



Ligaments, 8, 14, 16, 18 



Lipase, 120 



Lipoids, or lipins, 229 



Liver, 10, 21, 23 (fig.), 25, 26, 108 

 (fig.), 118 ff. 



Lobes and lobules of the lung, 13, 

 174; of glands, 29, 30 (fig.) 



Locomotion, nervous factors in, 276 



Lumbar vertebrae, 14 



Lungs, 10, 12, 21, 23 (fig.) ; structure 

 of, 169 ; apical lobes of. 174 



Lymph, 38 ; origin of, 38 ; environ- 

 ment of cells, 40, 138 ; gases of, 

 167 



Lymph flow, function of, 40 ; cause 

 of, 150 ; influenced by respira- 

 tory movements, 175 



Lymph spaces, 38 



Lymphatics, 39, 150 



Malt liquors, 293 



Massage, 150 



"Master neurones," 82 



Mastication, 104 



Meat a protein food, 93, 97 



Mediastinum, 11, 20 



Medulla oblongata. See Bulb 



Mental work, and the circulation, 

 155 ; after meals, 158 ; as influ- 

 enced by climatic conditions, 207 



Mesentery, 12 



Microbic life in the intestine, 130, 

 132 



Micromillimeter, or micron, 136 (fig.) 



Midbrain, 264 (fig.) 



Moisture, influence on temperature 

 regulation, 197 



Morphine, 304 



Motor nerves, 74 



Movements, active or passive, effect 

 on circulation, 149 ; respiratory. 

 See also Breathing movements 



Mucin, 44, 127 



Mucous coat, of stomach, 108 ; of 

 intestine, 117, 128 (fig.) 



Muscle fibers, 34, 35 ; of stomach 

 and intestine, 108, 117, 128; of 

 arteries and veins, 148 



