Cuticular control of diffusional water permeability |
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| Authors: | Robert D Prusch Dale J Benos |
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| Institution: | 1. Division of Biological and Medical Sciences, Brown University, Providence, Rhode Island 02912, U.S.A.;2. Department of Physiology and Pharmacology, Duke University Medical Center, Durham, North Carolina, U.S.A. |
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| Abstract: | The diffusional water permeability (Pd) in various gut structures of the fleshfly, Sarcophaga bullata, was measured using tritiated water. Water Pd in the larval hindgut was 3.91 × 10?6 cm/sec, whereas in the adult hindgut it was 4.4 × 10?4 cm/sec. The presence of cuticle in various parts of the gut apparently controls the water permeabilities of these structures. Furthermore, the water permeability of the cuticle may be correlated with the mechanism for the production of a hyperosmotic excretion in the hindgut. |
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