Physiology of Secretion

Physiology of Secretion

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...the alveoli and ducts relax, and the cells take up water and food from the lymph. The latter process is hastened probably by a temporary vaso-dilation ensuing when the sympathetic stimulation is broken. In virtue of the food, oxygen and lymph thus brought to them the cells form new undifferentiated protoplasm. On several successive stimulations the accumulated metabolic products are largely discharged, the cells become smaller and the nuclei, relieved from pressure, become round and move toward the center of the cells. The same explanation holds also for the changes following stimulation of the dilator secretory nerve, with the exception that the stored products are dissolved out of the cell, instead of being squeezed out, and as vaso-dilation accompanies this secretion the changes take place at a more rapid rate. These changes are discussed more at length in my paper on the Pancreas Cell. i. Summary And Conclusion. The phenomena of sympathetic secretion, which have been considered, could hardly indicate more clearly, I think, the muscular mechanism of that secretion. The sudden gush of saliva; its sudden cessation, however prolonged the stimulation; the diminution in the amount of saliva secreted when the stimulations are rapidly repeated; the apparent paralysis of the nerve when the ducts are empty and its restoral to power if the ducts be passively redistended; the augmentation in volume of the secretion, when the ducts are abnormally full of fluid saliva, and the diminution in amount of secretion when there is little saliva present; the dependence of the character of the sympathetic saliva upon that present in the gland at the moment of stimulation; the back flow of saliva into the gland on stopping stimulation when the gland is secreting...
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Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236514637
  • 9781236514639