. Electro-physiology . Fic. 47.—Schema of suprrp isitimi of two twitches. (Helmholtz.) mum of shortening was reached much sooner after the second excitation than in a single twitch, , in other words, the period of rising energy is shorter in the second twitch than in the first. If, with v. Kries, we denote the interval at which the apex of the summated twitches succeeds the second stimulus, the " apex-time," and the magnitude of the ordinates of the sum- mated twitch the " apex-height," we find that (as above) in a series of " rising " or " falling "
. Electro-physiology . Fic. 47.—Schema of suprrp isitimi of two twitches. (Helmholtz.) mum of shortening was reached much sooner after the second excitation than in a single twitch, , in other words, the period of rising energy is shorter in the second twitch than in the first. If, with v. Kries, we denote the interval at which the apex of the summated twitches succeeds the second stimulus, the " apex-time," and the magnitude of the ordinates of the sum- mated twitch the " apex-height," we find that (as above) in a series of " rising " or " falling " summated contractions ( in the period of ascending or diminishing energy), discharged by two maximal induction currents, the " apex-time " decreases with a rising "apex-height" (Fig. 48). This is expressed in the accom- panying series of curves, in which the place of the second stimulus remains unaltered, while that of the first can be moved to any distance; the apex of the summated twitch falls so much farther from the first stimulus in proportion as it lies higher. If we compare a rising and falling summated twitch, it will be found that the " apex-time " of the first is higher than that of the
Size: 3603px × 1387px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
