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Osmotic effects on the fine structure of the kidneys and hearts of some bivalves: the site of urine formation
Khan, H.R.; Saleuddin, A.S.M. (1990). Osmotic effects on the fine structure of the kidneys and hearts of some bivalves: the site of urine formation, in: Morton, B. (Ed.) The Bivalvia: Proceedings of a Memorial Symposium in honour of Sir Charles Maurice Yonge (1899-1986) at the 9th International Malacological Congress, 1986, Edinburgh, Scotland, UK. pp. 237-248
In: Morton, B. (Ed.) (1990). The Bivalvia: Proceedings of a Memorial Symposium in honour of Sir Charles Maurice Yonge (1899-1986) at the 9th International Malacological Congress, 1986, Edinburgh, Scotland, UK. Hong Kong University Press: Hong Kong. ISBN 962-209-273-X. 355 pp., more

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    VLIZ: Proceedings [7770]

Keyword
    Marine

Authors  Top 
  • Khan, H.R.
  • Saleuddin, A.S.M.

Abstract
    The fine structure of the hearts and kidneys of osmotically stressed marine Mytilus, Mercenaria and freshwater Anodonta were studied. Osmotic stresses were given to Mytilus and Mercenaria by keeping them in 50% sea water, and to Anodonta by keeping them in distilled water and 6% sea water for various periods. Epicardial cells of the auricle and the ventricle in these species are not podocyte-like cells. Epicardial cells of the auricle and the ventricle of Anodonta and Mercenaria form a thin epithelium, in which the cells are apically attached with zonula adherentes and well formed zonula-type (belt junction) septate junctions. The auricle of Mytilus varies from the other two species by the presence of surface pericardial glands that cover most of its surface. The auricle wall of this animal also contains cuboidal epicardium except where the pericardial glands are attached. The tubular pericardial glands consist of podocyte-like cells. These cells are also dispersed in the auricle wall underneath the epicardial cells. The podocyte-like cells stain for iron in Perl's reaction. Electron dense particles from 5-10 nm in diameter are observed in granules and in the extracellular spaces of the foot-processes of these cells. The podocyte-like cells display endocytotic profiles. These cells are similar to ubiquitous molluscan pore cells. The kidney is composed of a convoluted single cell layered epithelium. The lateral intercellular spaces and the spaces between the basal membrane infoldings of kidney epithelium are influenced by osmotic stress. The role of the podocyte-like cells, hydrostatic pressure and the kidney epithelium in urine formation is discussed.

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