Recent advances in the physiology of digestion.

  • Starling, Ernest Henry, 1866-1927.
Date:
1906
Catalogue details

Licence: In copyright

Credit: Recent advances in the physiology of digestion. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    have seen that the psychical juice depends merely on appetite, and therefore will be greater in amount the more welcome the food is to the animal. On the other hand, the juice secreted in the second phase must vary according to the quantity of gastric hormone produced in the pyloric mucous membrane, and there- fore with the nature and amount of the substances produced in the preliminary digestion of the gastric contents by means of Hours. Gastric secretion after 100 grs. meat. Two experiments. Hours. Gastric secretion after 600 cc. milk. Two exijeriments. Quantity of juice. Quantity of Juice. 1 11-2 12-6 1 8-75 . 8-23 2 8-2 80 2 7-5 60 3 4-0 2-2 3 22-5 23^0 4 1-9 . . 11 4 9-0 6-25 5 0-1 a drop 5 2-0 1-5 Total 25-4 23-9 Total 49-75 . 45-0 the psychic juice. The amount of juice may vary also with the salts contained in the food, according to their alkaline or acid character, and the percentage of pepsin in the juice may vary with the intensity of stimulus as well as with the quantity of fluid available for the formation of the gastric juice. These factors will co-operate in determining the characters of the whole juice secreted after any given meal, and it seems pos- sible to explain the variations, observed on such different diets as meat and bread, without having recourse to the difficult assumption of a specific sensibility of the gastric mucous membrane to such inert substances as starch, dextrin, or egg albumen.