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Journal of Experimental Biology 75,133-145 (1978)
Published by Company of Biologists 1978

Physiological Discontinuity in an Epithelium with an Apparently Uniform Structure

S.H. P. MADDRELL ¹

¹ Agricultural Research Council Unit of Invertebrate Chemistry and Physiology, Department of Zoology Downing Street, Cambridge CB2 3EJ, England

The lower Malpighian tubule of Rhodnius is made up of cells of apparently uniform structure. Functionally, however, this length of the Malpighian tubule consists of two distinct regions. The upper region is osmotically very permeable and plays no part in reabsorbing KC1 from the primary excretory fluid. By contrast, the lowermost 30% of the length of the lower tubule is osmotically impermeable and when stimulated absorbs KCl from the lumen at the high rate of about 0.80 µmol cm^-2 min^-1. In other respects such as permeability to other solutes and the ability to transport alkaloids the two regions scarcely differ.

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