A text-book of physiology, for medical students and physicians . latinum wire (w) through which an electrical currentmay be sent. The object of this arrangement is to heat the catgutsuddenly. The platinum coil should not actually touch the catgut is attached to a lever, as shown in the figure. Thecatgut is thoroughly soaked by immersing it in a beaker of waterand the temperature is then raised to 50° to 55° C. If then acurrent is turned into the coil the slight but somewhat rapid heatingof the catgut will cause it to shorten, owing to the imbibition ofmore water. When the current is
A text-book of physiology, for medical students and physicians . latinum wire (w) through which an electrical currentmay be sent. The object of this arrangement is to heat the catgutsuddenly. The platinum coil should not actually touch the catgut is attached to a lever, as shown in the figure. Thecatgut is thoroughly soaked by immersing it in a beaker of waterand the temperature is then raised to 50° to 55° C. If then acurrent is turned into the coil the slight but somewhat rapid heatingof the catgut will cause it to shorten, owing to the imbibition ofmore water. When the current is broken the catgut cools andrelaxes slowly. Records may be obtained in this way which arealtogether similar or identical with those given by a strip of plainmuscle when stimulated (see Figs. 28 and 29). The model may beused to show the effect of temperature upon the extent and dura- * Engelmann, Ueber den Ursprung der Muskelkraft, Leipzig, 1893;see also Pfliigers Archiv, 7, 155, 1873; and Archiv f. Physiologic,1907, 25. 74 THE PHYSIOLOGY OF MUSCLE AND Fig. 28.—Curve of simple contraction obtained from an artificial muscle. The dura-tion of the stimulus (heating effect caused by the current) is shown by the break in theline beneath the curve.
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