Abstract
IT is usually considered that the responses of coelenterates are not mediated by acetylcholine1, because: (1) there is no evidence of significant amounts of acetylcholine or choline esterase in their bodies; (2) neither these substances, nor atropine, nor curare, affects their neuromuscular activities2. However, I have recently found that acetylcholine (Roche) and physostigmine (eserine; B.D.H.) affect the spawning activity of Hydractinia echinata.
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References
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Ballard, W. W., Biol. Bull., 82, 329 (1942).
Yoshida, M., Experientia, 15, 11 (1959).
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YOSHIDA, M. Effect of Acetylcholine and Eserine on the Spawning of Hydractinia echinata . Nature 184, 1151 (1959). https://doi.org/10.1038/1841151a0
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DOI: https://doi.org/10.1038/1841151a0
