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Journal of Experimental Biology 90,101-108 (1981)
Published by Company of Biologists 1981

A Sodium-dependent ‘Twitch’ Muscle in a Coelenterate: The Ectodermal Myoepithelium of the Gastrozooids in Agalma SP. (Siphonophora)

BENJAMIN M. CHAIN 1

1 Department of Zoology, University of Cambridge; Sloan-Kettering Institute for Cancer Research, Donald S. Walker Laboratory, 145 Boston Post Rd., Rye, N.Y. 10580, U.S.A.

Intracellular recordings were obtained from the ectodermal cells of the gastrozooids of the siphonophore, Agalma sp. Stimulated gastrozooids undergo rapid longitudinal contractions that are immediately preceded by a series of action potentials which propagate throughout the epithelium. These rapid potentials arise from a much slower graded depolarization. Both potentials are abolished in low sodium solutions. Fast action potentials persist in the presence of manganese ions but both the slow potentials and contraction are abolished.

Submitted on February 8, 1980






© The Company of Biologists Ltd 1981