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Science 13 March 1981:
Vol. 211. no. 4487, pp. 1169 - 1171
DOI: 10.1126/science.7466387
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Articles

Science, Vol 211, Issue 4487, 1169-1171
Copyright © 1981 by American Association for the Advancement of Science

articles

Conduction system in a sponge

ID Lawn, GO Mackie, and G Silver

The hexactinellid sponge Rhabdocalyptus dawsoni is capable of arresting its exhalant water current in response to mechanical and electrical stimuli. The arrest is coordinated by a conduction system with a precise threshold of excitability and a chronaxie of 38 milliseconds. The response is propagated throughout the sponge at a mean velocity of 0.22 centimeter per second, and conduction is unpolarized.


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