. General physiology; an outline of the science of life. STIMULI AND THEIR ACTIONS 465 the exertion of the day, they have an indented contour (Fig. 241, £). Likewise in the cat, after stimulation for several hours, the nuclei of the ganglion-cells, which previously were vesicular and round, are shrunken and have an irregular contour, while the arrangement of the contents has changed materially (Fig. 240). According to Mann, and also Lugaro, the change of the ganglion- cell during its activity consists essentially in a turgescence of the protoplasm and the nucleus, while during rest a diminutio
. General physiology; an outline of the science of life. STIMULI AND THEIR ACTIONS 465 the exertion of the day, they have an indented contour (Fig. 241, £). Likewise in the cat, after stimulation for several hours, the nuclei of the ganglion-cells, which previously were vesicular and round, are shrunken and have an irregular contour, while the arrangement of the contents has changed materially (Fig. 240). According to Mann, and also Lugaro, the change of the ganglion- cell during its activity consists essentially in a turgescence of the protoplasm and the nucleus, while during rest a diminution in volume takes place. During work the nucleus becomes poorer in chromatin, and, as Lugaro found, by fatigue the nucleolus can. Pro. 240.—Ganglion-cells of the cat. A, In the normal condition ; B, after five hours' stimulation. (After Hodge.) be made completely to disappear. Here belong, also, the fatigue- changes which Heidenhain ('83) observed a long time ago in salivary glands after stimulation, the cell-nuclei of which, in rest, put out pseudopodium-like processes, but after stimulation assume the spherical form (Fig. 242). The fatigued muscles recover as soon as the stimulation ceases, and the more rapidly, the less was the degree of fatigue. In recovery the irritability gradually increases; the various pheno- mena of fatigue, which can be seen in the curve of contraction, gradually pass away, and, finally, the muscles are in the same condition as before. H H. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Verworn, Max, 1863-1921; Lee, Frederic S. (Frederic Schiller), 1859-1939. London, Macmillan and co. , limited; New York, The Macmillan company
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