. A text-book of physiology : for medical students and physicians . D Fig. 290.—Parotid gland of the rabbit in a fresh state, showing portions of the secret-ing tubules: A, In a resting condition; B, after secretion caused by pilocarpin; C, afterstronger^ secretion, pilocarpin and stimulation of sympathetic; D, after long-continuedstimulation of sympathetic.—(After Langley.) so that each cell now shows an outer, clear border and an innergranular one. If the stimulation is continued the granules becomefewer in number and are collected near the lumen and the marginsof the cells, the clear zone i
. A text-book of physiology : for medical students and physicians . D Fig. 290.—Parotid gland of the rabbit in a fresh state, showing portions of the secret-ing tubules: A, In a resting condition; B, after secretion caused by pilocarpin; C, afterstronger^ secretion, pilocarpin and stimulation of sympathetic; D, after long-continuedstimulation of sympathetic.—(After Langley.) so that each cell now shows an outer, clear border and an innergranular one. If the stimulation is continued the granules becomefewer in number and are collected near the lumen and the marginsof the cells, the clear zone increases in extent, and the cells becomesmaller (Fig. 290, C, D). Evidently the granular material is usedin some way to make the organic material of the secretion. Since theptyalin is a conspicuous organic constituent of the secretion, it isassumed that the granules in the resting gland contain the ptyalin,or rather the preliminary material from which the ptyalin is con-structed during the act of secretion. On this latter assumption thegranules are frequently
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