Hostname: page-component-848d4c4894-x5gtn Total loading time: 0 Render date: 2024-06-06T23:32:29.307Z Has data issue: false hasContentIssue false
  • English
  • Français

Digestion in the Plaice (Pleuronectes platessa)

Published online by Cambridge University Press:  11 May 2009

L. E. Bayliss
L. E. Bayliss
Affiliation:
Physiologist at the Plymouth Laboratory.
Get access Rights & Permissions [Opens in a new window]

Extract

1. It has been shown that the stomach of the plaice can digest proteins by an extra-cellular enzyme—apparently pepsin. Fats and carbohydrates appear to be unattacked in the stomach.

2. In the intestine, proteins are further attacked and the mucous membrane contains a trypsin and an erepsin.

3. The liver and the wall of the gall-bladder are more potent sources of trypsin than is the intestine; the former contains, also, a cathepsin, and the latter an erepsin. It is not certain whether any of these enzymes can be secreted into the intestine; administration of pilocarpine failed to make the bile definitely active in digesting proteins, but it is possible that there may be some other route by which the secretion may reach the intestine.

4. Fats and carbohydrates are digested in the intestine, since the mucous membrane of the intestine—and also the wall of the gall-bladder and the liver—contain lipase and amylase. The liver is a far more potent source of lipase than is either the gall-bladder or the intestine, but this lipase may be partly intra-cellular in action.

5. The hydrogen-ion concentration of the contents of the stomach and intestine has been shown to be consistent with the extra-cellular action of the enzymes found in the respective mucous membranes. The mucous membrane of the stomach is capable of secreting acid, and that of the intestine is capable of bringing about its neutralisation.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 20 , Issue 1 , February 1935 , pp. 73 - 91
Copyright
Copyright © Marine Biological Association of the United Kingdom 1935

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anrep, G. V., Lush, J. L. and Palmer, M. G. 1925. Observations on pancreatic secretion. J. Physiol., 59, 434.CrossRefGoogle ScholarPubMed
Babkin, B. P. and Bowie, D. J. 1928. The digestive system and its function in Fundulm heteroclilus. Biol. Bull., 54, 254.Google Scholar
Cole, S. W. 1903. Contributions to our knowledge of the action of enzymes. Part I. The influence of electrolytes on the action of amylolytic ferments. J. Physiol., 30, 202.Google Scholar
Cole, F. J. and Johnstone, J. 1901. L.M.B.C. Memoirs VIII. Pleuronectes. London.Google Scholar
Dawes, Ben. 1930. The absorption of fats and lipoids in the Plaice (P. platessa L.). J. Mar. Biol. Assn., 17, 75.Google Scholar
Euler, U. S. v. and Heymans, C. 1932. An oxygenator for perfusion experiments. J. Physiol., 74, 2P.Google Scholar
Kerridge, P. M. T. 1931. A new clinical method for the estimation of protein in urine. Lancet, 221, 21.Google Scholar
Mackay, M. E. 1929a. The digestive system of the eel-pout (Zoarces anguillaris). Biol. Bull., 56, 8.CrossRefGoogle Scholar
Mackay, M. E. 1929b. Note on the bile in different fishes. Biol. Bull., 56, 24.CrossRefGoogle Scholar
Northrop, J. H. 1932. Pepsin activity units and methods for determining peptic activity. J. Gen. Physiol., 16, 41.CrossRefGoogle ScholarPubMed
Stern, K. G. 1931. Ülber die autolytische Wirksamkeit der tierischen Gewebsproteinasen und ihre Beeinflussung durch Schwermetalle. Biochem. Z., 234, 116.Google Scholar
Vonk, H. J. 1927. Die Verdauung bei den Fischen. Z. vergl. Physiol., 5, 445.Google Scholar
Willsttäter, R. and Bamann, E. 1928. Über die Proteasen der Magenschleimhaut. Erste Abhandlung über die enzyme de Leukocyten. Z. physiol. Chem., 180, 127.Google Scholar