. Electro-physiology . FK.;. 72.—1-S, Contraction curves on excitation of the muscle by single induction shocks ; 9-iy, con- traction curves (make twitches) on exciting with the constant current ("tetanus " character). (Tigerstedt.) where the magnitude of effect as dependent upon the duration of the excitation appears to be in exact inverse ratio with the mobility of the particles of an irritable substance. The extra- ordinarily small and often negative effect of single induction shocks on many protozoa, and on vegetable protoplasm, is well known, while in smooth muscle such short st
. Electro-physiology . FK.;. 72.—1-S, Contraction curves on excitation of the muscle by single induction shocks ; 9-iy, con- traction curves (make twitches) on exciting with the constant current ("tetanus " character). (Tigerstedt.) where the magnitude of effect as dependent upon the duration of the excitation appears to be in exact inverse ratio with the mobility of the particles of an irritable substance. The extra- ordinarily small and often negative effect of single induction shocks on many protozoa, and on vegetable protoplasm, is well known, while in smooth muscle such short stimuli, if they act at all, first take effect at a high intensity, although they seldom or never fail to excite the rapidly twitching striated fibres. This is remarkably well seen on every relaxed (a-tonic) pre- paration from the adductor muscles of anodonta (3). From these, as was said above, it is easy to obtain a preparation as susceptible to electrical excitation as the frog's sartorius (Fig. 73). N
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