. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. PHYSIOLOGY OF MOVEMENT. 715 curve will be produced as is represented by Fig. 279. The two con- tractions are thus added together and the total shortening may be nearly double that produced by a single contraction (Fig. 280). If a third stimulus is then allowed to pass into the nerve before the second contraction has passed off, a third contraction will be added to the second, and so on in the case of the fourth, fifth, or more. It will be, howe
. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. PHYSIOLOGY OF MOVEMENT. 715 curve will be produced as is represented by Fig. 279. The two con- tractions are thus added together and the total shortening may be nearly double that produced by a single contraction (Fig. 280). If a third stimulus is then allowed to pass into the nerve before the second contraction has passed off, a third contraction will be added to the second, and so on in the case of the fourth, fifth, or more. It will be, however, noticed that while the second contraction may be nearly or quite as extensive as the first, the third and fourth progressively decrease in extent, until finally simply a broken line without any extensive increase in contraction will indicate the entrance of the separate stimuli, the stimuli merely serving to keep up the contraction already produced. When the stimulation ceases the muscle then rapidly passes into a condition of rest, relaxation occurring very Fig. 281.—Muscle Thrown into'Tetanus when the Primary Current of as Induction Machine is Repeatedly Broken at Intervals or Six- teen in a Second. (Foster.) (To be read from left to right.) The upper Hue is that described by the muscle. The lower marks time, the intervals between the ele- vation indicating seconds. The intermediate line shows when the shocks were sent in, each mark corre- sponding to a shock. The lever, which describes a straight line before the shocks are allowed to fall into the nerve, rises almost vertically (the recording surface moving slowly) as soon as the first shock enters the nerve at <i. Having risen to a certain height it begins to fall again, but in its fall is raised once more by the second shock, and that to a greater height than before. The third and succeeding si kg have similar effects, the muscle continuing to become shorter, though the shortening at each shock is less.
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