Premium
Direct absorption of amino acids and glucose by the branchial sac and the digestive tract of benthic filter‐feeders (Ascidians)
Author(s) -
FialaMedioni A.,
Pequignat E.
Publication year - 1980
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1980.tb04240.x
Subject(s) - biology , ciona intestinalis , gastrointestinal tract , absorption (acoustics) , anatomy , small intestine , digestive tract , digestion (alchemy) , biochemistry , medicine , chromatography , chemistry , physics , gene , acoustics
In Clavelina, Ciona, Phallusia and Styela , the branchial sac, the stomach and the intestine are involved in the absorption of dissolved amino aids and glucose. Autoradiography and double countings on 14 C and 3 H labelled samples show that, in the first hour, the branchial sac can concentrate several hundred times the dissolved nutritive molecules from dilute solutions, whereas the digestive tract is not involved significantly. In Phallusia the hepato‐pancreas has a specific activity higher than in the intestine and may be an organ of storage. In all species, the branchial sac absorbs the largest proportion of labelled material.