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Science 12 January 1973:
Vol. 179. no. 4069, pp. 194 - 195
DOI: 10.1126/science.179.4069.194
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Articles

Water Excretion by Hydra

Martin Macklin 1, Thomas Roma 1, and Kevin Drake 1

1 Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106

Hydra were cut so that regenerates consisting only of the central gastric region were formed. This region, which has no natural opening to the environment, is capable of osmoregulation and of removing excess fluid from the gut. The fluid is excreted through a break in the body wall created as a result of a strong contraction when the gut is distended with fluid. A normal hydra, therefore, must remove excess fluid by contracting and expelling it through its mouth.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)