QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by McFARLANE, I. D. Search for Related Content PubMed Articles by McFARLANE, I. D.

Journal of Experimental Biology 58,77-90 (1973)
Published by Company of Biologists 1973

Spontaneous Electrical Activity in the Sea Anemone Calliactis Parasitica

I. D. McFARLANE ¹

¹ Gatty Marine Laboratory, University of St Andrews, Scotland

1. Activity in the three known conduction systems in Calliactis parasitica (nerve net, SS 1, SS 2) has been monitored for periods up to 2 h.

2. The ectodermal slow system (SS 1) shows irregular activity and many of the observed spontaneous pulses may in fact result from undetected external stimuli.

3. The SS 2 shows rhythmic changes in frequency (approximate range 0.2-7.5 pulses/min.)

4. During periods of low-frequency SS 2 activity a short (up to 10 pulses), high-frequency (up to 15/min) burst of activity in the through-conducting nerve net is seen. A slow contraction of the sphincter muscle is often seen after a nerve net burst.