. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ve and, from ner are con- f). A. dnrinK 'Mtj â gmmnwrtn l^ns. Proto- n substance^ :li we term a 3 changes as i), though we w is, at best, ibt if it may K)nception to Emd "active" I living cells if these terms ity, they need in certain of m simultane- n, or mother* ito actual
. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ve and, from ner are con- f). A. dnrinK 'Mtj â gmmnwrtn l^ns. Proto- n substance^ :li we term a 3 changes as i), though we w is, at best, ibt if it may K)nception to Emd "active" I living cells if these terms ity, they need in certain of m simultane- n, or mother* ito actual fer- uBually more I sympathetic, rlwtever, not- follows, frcmi 1 raK a whole;. B but general, ioh gland and r for different ocess depend- nd if in this, ital processes tier glands, as DIGESTION OF FOOD. 829 the kidneys and the lungs, or, indeed, apply such crude concep- tions to the subtle processes of living protoplasm anywhere or in any form P It is somewhat remarkable that an extract of a perfectly fresh pancreas is not proteolytic; yet the gland yields such an extract when it has stood some hours or been treated with a weak acid. These facts, together with the microscopic appear- ances, suggested that there is formed a forerunner^to the actual fermentâa zymogen, or mother-ferment, which at the mbment of discharge of the completed secretion is converted into the actual ferment. We might, therefore, speak of a pepsinogen, typsinogen, etc., and, though there may be a cessation in the series of processes, and no doubt there is in some animals, this may not be the case in all or in all glands. BMNtiaa I17 fhs BtoouMh.âThe glands of the stomach differ in most animals in the cardiac and pyloric regions. In those of the former sone, both cent. jJ, columnar, aiid parietal (ovoid) cells are to be recognized. It was thought that possibly the latter were concerned in the secretion of the acid of the stomach, but this is by no means certain. Possibly these, like the demilune c
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
