Index 



Absorption, ionic, 91 



of food, body region for, 149 

 Acidity, gastric. See Hydrogen ion con- 

 centration. 

 Acclimatization, temperature, 346-349 



metabolic changes in, 349 

 Accommodation, 399 



range of vertebrate eye, 395 

 Acetylcholine, 540 



action of, 546, 548, 557, 558, 559, 560 

 content of nervous tissue, 792 

 effect on melanophores in fish, 708 

 effect on visceral muscles, 606 

 in electric organs, 620 

 in neuromuscular transmission, 608 

 nerve conduction and, 781 

 Acetylcholinesterase, 608 

 Actin, 578 

 Actiniohematin, 294 

 Action potential, muscular, 587 

 nerve, ionic basis of, 780 



wave, 777 

 retinal, 421 



effect of temperature on, 423 

 optic nerve activity and, 434 

 Actomyosin, 578 



Adaptation, dark, electrical measurement 

 of, 426 

 in Mya, 406 

 kinetics of, 415 

 nerve impulse in, 432 

 genetic, 3 

 metabolic, 268-277 

 of mechanoreceptors, 510 

 physiological, 2 

 to temperature, 374 

 visual, irK lower vertebrates, 397-405 

 Adenine, excretion of, 189 

 Adenosine triphosphate, breakdown of, 615 

 Adjustment, osmotic, 10-14 

 Adrenal gland, androgen production by, 

 744 

 cortex of, effect on water and salt 

 balance, 760 

 growth and, 727 



hormones, effect on carbohydrate 

 metabolism, 757 

 progestin production by, 746 



Adrenalin, 537 

 effects of, 561 

 on heart, 557 

 on spinal cord, 794 

 on visceral muscles, 606 

 in neuromuscular transmission, 612 

 regulation of heart and, 548 

 Adrenergic regulation of hearts, 557 



systems in muscle, 612 

 Adrenin, 537 



effect on carbohydrate metabolism, 757 

 See also Adrenalin. 

 Aedes, larvae of, osmoregulation in, 33 

 aegypti, essential amino acids for, 117, 

 120 

 After-discharge in nerve centers, 805 

 Age, critical oxygen tension and, 250 



oxygen consumption and, 228 

 Agglutinins, 106 



Air, dry, poikilotherms inhabiting, 353 

 moist, poikilotherms inhabiting, 351 

 temperature of, as related to body tem- 

 perature in mammals, 363 

 body temperature and, 351 

 vision in, 403 

 Alanine, structural formula, 119 

 Albumin, serum, molecular size, 105 

 Ahmentary tract, diagrammatic representa- 

 tion of, 148 

 functional regions of, 147 

 mucosa of, as respiratory mechanism, 

 218 

 Allantoic acid, 189 -' 

 Allantoicase, distribution of, 203-205 

 Allantoin, 189 



Allantoinase, distribution of, 203-205 

 Allatectomy, effect on reproductive cycles 



of insects, 754 

 Altitude, effect on oxygen capacity of 

 blood, 312 

 oxygen capacity and saturation and, 316 

 Amhly stoma, embryo of, respiration in, 

 229, 232 

 embryonic behavior in, 827 

 phonoreception in, 487 

 Ameiurus, color changes in, 710 

 Amino acids, essential, 117 

 excretion of, 187 



863 



