For meal-worms, which are able to survive under extremely dry living conditions, the normal situation is that the K+ concentration of the haemolymph regulates the process of water conservation via the rectal complex (Grimstone, Mullinger & Ramsay, 1968; Koefoed, 1975). The aim of this paper has been to study the handling of sodium and potassium by the midgut epithelium of the larva of Tenebrio molitor and to discover if the transport of these ions is reflected in the structure of the epithelium.

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