File:American journal of physiology (1898) (14595655009).jpg

Identifier: americanjourn01ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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1 Oscar Israel: Arch, fiir Anat. u. Physiol, (physiol. Abth), 1877, p. 443. Fig. 3. 12 3 4 5 G Units of Stimulating Current. Isolated sciatic of the dog.Experiment 106. Showing the relation between thestrength of an external stimulus andthe strength of the resulting actioncurrent. Units of stimulating currentalong the abscissas, units of action cur-rent along the ordinates. For the full extent of the upper straightlimb of the curve, compare with Fig.4. This experiment was performedafter the nerve had been kept alive inthe moist chamber at room tempera-ture for 16 hours. External Stimulus and Nerve Impulse. 113 warm nerve gave no response even to the strongest stimuli, while thecooled nerve was still alive as shown by the strong action current.A nerve taken from the body of a dog after 15 hours, was dead, whilenerves from the same dog removed immediately and kept on filterpaper for 15 hours were still alive and very irritable, as shown b\the marked action current caused by stimulation.
Text Appearing After Image:
5 6 7 Units of Stimulating Current. Fig. 4. Sciatic of the dog. Experiments 91, 95, and 118. Curves expressing the relation between the strength of stimulating current and the result-ing action current. No. 91, ab, from the nerve immediately after its removal fromthe body. No. 95, cd, from the same nerve after 17 hours in a moist chamber atroom temperature. The curve cd shows in comparison with the curve ab the increasein irritability and decrease in the amount of the action current which occurs whennerves are kept for some time. No. 118, ef, the beginning of a curve introduced hereto show the initial minimal portion convex to the abscissa. Curve cd also shows thephenomenon. The values of the stimulating current and the action current are notgiven in curve ef, but the magnification is about twice that of the curves ab and cd. Nerves from dogs and cats remain alive in the moist chamber atroom temperature a surprisingly long time. Nerves from the doghave been frequently kept alive over

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