1043 



Intestines, small, movements of, 722 

 Intracellular enzymes, 969 

 Intracranial pressure, 620 

 Intra-ocular pressure, 326 

 Intrapulmonic pressure, 651 

 Intrathoracic pressure, 652 

 origin of, 654 



variations of, with forced breath- 

 ing, 653 

 Intraventricular pressure, 544 

 Introductory contractions of muscle, 



35 

 Invertase, 745, 796 

 Involuntary muscle, 54 

 lodin constituent of thyroid tissue, 



869 

 lodothyrin, 869 

 Iris, action of drugs upon, 324 



antagonistic action of muscles upon, 

 321 



muscle^s and nerves of, 321 

 Iron, effect of removal of spleen on, 

 828 



in hemoglobin, 427 



salts, source and nutritive impor- 

 tance of, 924 

 IrritabiUty, definition of, 23 



of muscle, 23 



of nerve-fibers, 86 

 Isodynamic equivalent of foodstuffs, 



943 

 Isoleucin, 790, 1019 

 Isometric muscular contractions, 28 

 Isotonic muscular contractions, 28 



solutions, definition of, 1030 

 Isotropous substance in muscle, 20 



Jacobson, nerve of, 747 

 Judgments, visual, of distance and 

 size, 378 

 perspective or solidity, 373 



Kidney, action of diuretics on, 836 



blood-flow through, 837 



composition of secretion of (urine), 

 839 



function of convoluted tubules, 834 

 of glomerulus, 832 



secretion of urine in, 830 



stimulation of, by hormones, 839 



structure of, 829 

 Kinases, 745 

 Kjeldahl's method for determination 



of nitrogen, 842, 890 

 Knee-jerk, conditions influencing, 157 



definition of, 153 



explanation of, 155 



reinforcement of, 154 



use of, as diagnostic sign, 158 

 Krause's membrane, 20 



Labor, physiology of, 991 

 Lactacidogen, 68 

 Lactic acid, 909 

 in muscle, 63 



increase of, during contractions, 

 63,67 

 Laked blood, 420 

 Langerhans, islands of, 886 

 Large intestine, digestion and absorp- 

 tion of food in, 802 

 movements of, 726 

 Larynx, reflex effects from, on respi- 

 rations, 690 

 Latent period of muscular contraction, 



27 

 Law, all or none, 29 



of constant energy consumption, 

 1015 

 growth-quotient, 1016 



of intestine, 723 



of surface area, 958 

 Lead sidphid reaction for proteins, 



1023 

 Lecithin, 80, 814 

 Lecithoproteins, 1026 

 Lemniscus, lateral, 213 



median, 203 

 Leucin, 790, 902, 1019 

 Leukocytes, effect of hemorrhage 

 upon, 467 



functions of, 441 



structure and classification, 440 



variations in nmiiber of, 441 

 Leydig's cells, 883 

 Liebermann's reaction for proteins, 



1023 

 Liebig's classification of foodstuffs, 933 

 Light-reflex in eye, 322 

 Lipase, 742 



activation of, 794 



in pancreatic secretion, 792 



reversible reaction of, 739 

 Lipoids, 80 



Lissauer, tract of, 166, 167 

 Listing's law, 367 



schematic eye, 306 

 Liver, acids of, 811 



bile pigments of, 810 



formation of urea in, 825 



glycogen of, 819 



glycogenic action of, 822, 823 



internal secretion of, 864 



pulse, 525 



quantity of bile, 809 



secretion of bile, 814 

 Localization of function in cerebellum, 

 240 

 in cerebrum, 191 

 Locahzing power of skin, 280 

 Locke's solution, 565 

 Locomotor ataxia, 169 

 Ludwig theory of urinary secretion, 830 



