. Electro-physiology. Electrophysiology. ii CHANGE OF FORM IN MUSCLE DURING ACTIVITY 125 attention to the remarkable physiological differences between red and pale muscles in the rabbit, and more particularly to the enormous differences which he found in the stimulation-frequency required to produce tetanus, while Kroiiecker and Stirling (14) subsequently ascertained that the red muscle of rabbit, in corre- spondence with the sluggish process of contraction, is thrown by 4 stimuli per sec. into incomplete, by 10 per sec. into fairly complete, tetanus. With stimulation intervals of ^ sec. the p
. Electro-physiology. Electrophysiology. ii CHANGE OF FORM IN MUSCLE DURING ACTIVITY 125 attention to the remarkable physiological differences between red and pale muscles in the rabbit, and more particularly to the enormous differences which he found in the stimulation-frequency required to produce tetanus, while Kroiiecker and Stirling (14) subsequently ascertained that the red muscle of rabbit, in corre- spondence with the sluggish process of contraction, is thrown by 4 stimuli per sec. into incomplete, by 10 per sec. into fairly complete, tetanus. With stimulation intervals of ^ sec. the pale muscle recovers its extension again almost completely, while the red, though trembling, remains tensely contracted. The pale muscle of rabbit requires from 20 to 30 stimuli for complete tetanus. Analogous curves are obtained from corre-. FIG. 58.—Tetanus curve of tail- and claw-muscles of Crab with uniform excitation. The quick tail-muscles fall into incomplete clonic tetanus, the sluggish claw-muscles into complete tetanus. (Richet.) spending excitation of the quick tail- and sluggish claw-muscles of the crab (Eichet, 4) (Fig. 58). Very characteristic, and functionally weighty, differences of tetanus contraction were found by Eollett (8) in the anatomically and physiologically different muscles of hydrophilus and dytiscus. Besides the fact that in this case also the quick, rapidly-contract- ing muscles of dytiscus require a higher stimulation-frequency to enable them to contract than the sluggish muscles of hydro- philus, as at once appears from Fig. 59, a, b, another important difference exists in the course of a prolonged and complete tetanus. The first tetani yielded by freshly-prepared dytiscus muscles rose more steeply, and fell much more rapidly, than those of hydrophilus muscles, in which the long duration of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th
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