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American Zoologist 1976 16(2):131-139; doi:10.1093/icb/16.2.131
© 1976 by The Society for Integrative and Comparative Biology
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Functional Design of the Neurosecretory System Controlling Diuresis in Rhodnius prolixus.

S. H. P. MADDRELL
Agricultural Research Council Unit of Invertebrate Chemistry and Physiology, Department of Zoology Cambridge, England

The blood sucking insect Rhodnius has hormonal mechanisms controlling fluid secretion by the upper Malpighian tubules (diuretic hormone); KCl reabsorption by the lower tubules; and, possibly, fluid absorption from the midgut. The adaptations of the diuretic hormone release system to the rapid onset and subsequent maintenance of a massive post-feed diuresis are described. Possible ways of coordinating the activities of the three transporting epithelia are discussed. Reabsorption of KCl, once fully hormonally activated, is directly regulated by haemolymph K levels, but haemolymph volume is envisaged to be controlled hormonally, through regulation of midgut fluid transport. The possibility of feedback control by hormones on their release sites is discussed.


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