. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. \ 466 COMPARATIVE PHYSIOLOGY. yagi leads to degeneration of the cardiac atruoture. We now know that this nerve containa flben which have a divene action on the metabo]i«m of the heart, and that, according aa the one or the other set is stimulated, so does the electri- cal condition vary; and everywhere, so far as known, a differ- ence in electrical conditions seems to be associat
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. \ 466 COMPARATIVE PHYSIOLOGY. yagi leads to degeneration of the cardiac atruoture. We now know that this nerve containa flben which have a divene action on the metabo]i«m of the heart, and that, according aa the one or the other set is stimulated, so does the electri- cal condition vary; and everywhere, so far as known, a differ- ence in electrical conditions seems to be associated with a difference in metabolism, which may be one of degree only, perhaps, in many instances—still a difference. The facts as brought to light by experimental stimulation harmonize with the facts of degeneration of the cardiac tissue on section of the vagi; but this is only dear on the view we are now presenting, that the action of the nervous system is not only universal, but that it is constant; that function is not an isolated and independent condition ol an organ or tissue, but a part of a long series of metabolic changes. It is true that one or more of such changes may be arrested, just as all of them may go on at a less rate, if this actual outpouring of pancreatic secre- tion is not constant; but secretion is not summed up in dis- charge merely; and, on the other hand, it would seem that in some animals the granules of the digestive glands are being renewed while they are being used up, in secreting cells. The processes may be simultaneous or successive. Nor do we wish to imply that the nervous system merely holds in check or in a very general sense co-ordinates processes that go on unorigi- nated by it. We think the facts warrant the view that they are in {he highest mammals either directly (mostly) or indirectly originated by it, that they would not take place in the absence of this constant nervous influence. The facts of common ob- servation, as well as the
Size: 1205px × 2074px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
