Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 IV ELECTROMOTIVE ACTION IN MUSCLE 403 photogram that the first ' phasic action current' follows the excitation at a short interval, the apex being for an infinitesimal period, and very rapidly, positive to the base of the ventricle, after which there is a longer interval, in which the electrometer shows no deflection; then follows immediately the somewhat longer second (positive) phase of the action current, when the apex is negative to the base. On injuring the ventricle at one 130.— a, Photographic
Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 IV ELECTROMOTIVE ACTION IN MUSCLE 403 photogram that the first ' phasic action current' follows the excitation at a short interval, the apex being for an infinitesimal period, and very rapidly, positive to the base of the ventricle, after which there is a longer interval, in which the electrometer shows no deflection; then follows immediately the somewhat longer second (positive) phase of the action current, when the apex is negative to the base. On injuring the ventricle at one 130.— a, Photographic record of action current in the Frog's heart, with artificial excitation (as in Fig. 12', a). The interruptions of the dark line mark the moments of excitation, h, Photo- graphic record of action current after injuring the apex of the ventricle. The variation becomes monophasic. (Burden-Sanderson and Page.) of the two leading-off contacts, one phase of course disappears, and the variation becomes purely negative, monophasic (Fig. 1-'»0, Z>). Similar tracings of the spontaneously beating heart have been photographed by other investigators, Fig. 131, A. I). Waller,—which at first sight differs from the results of Sanderson and Page, but coincides essentially with them. Here we have a simultaneous record of the contraction curve (It, //), and the effect (c, c) produced on the capillary electrometer by the
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