Elements of Human Physiology, Tr. from the 5th Ed. by A. Gamgee

Elements of Human Physiology, Tr. from the 5th Ed. by A. Gamgee

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ...substance. There occur transitional conditions between contraction and rigor, as the 'idiomuscular contractions' on strong direct stimulation of muscle, and especially of dying muscle; further, the condition induced by stimulating muscles poisoned with veratria or similar muscular poisons; these contractions may continue a longer time, become permanent, and then constitute rigor. Whilst in former times rigor mortis used to be considered as indicating the last flickering of the vital activity, now that the nature of rigor has been recognized it is more correct to compare contraction to a transitory rigor, all of whose characteristics it possesses save only the separation of myosin; yet even the latter process may possibly occur at each contraction, and stand in the same close relation to it as to rigor. Were myosin to separate as a coaguluni in the muscular contents, but dissolve again immediately, we should have no means of discovering it. The connection between contraction and a process of coagulation finds an analogy in the fact that fibrous tissues containing proteids (tendons, nerves, &c), as well as fresh flakes of fibrin, contract just about the temperature of coagulation in the direction of their fibres (Hermann); a phenomenon which we must confess to be as little explained as is the shortening which occurs during the coagulation of rigor. Nature of the Chemical Processes in Muscle. The chemical processes which occur during muscular contraction, no less than during rigor, are independent of a supply of oxygen; for muscle can contract in vacuo or in indifferent gases. Further, as there is no store of oxygen in muscle, the chemical process cannot be one of oxidation, but it is a decomposition associated with the saturation of stronger...show more

Product details

  • 12-17
  • Paperback | 298 pages
  • 189 x 246 x 16mm | 535g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236497171
  • 9781236497178