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Journal of Experimental Biology 39,319-324 (1962)
Published by Company of Biologists 1962

The Mode of Action of the Corpus Cardiacum on the Hind Gut in Periplaneta Americana

K. G. DAVEY 1

1 Zoology Laboratory, University of Cambridge

1. Addition of a homogenate of corpora cardiaca to the fluid bathing an isolated hind gut of Periplaneta produces an increase in tonus, amplitude, frequency and co-ordination of contractions.

2. The corpus cardiacum acts by stimulating cells in the upper colon to release an indolalkylamine.

3. This amine acts on the mucles through a peripheral nervous system which can function in isolation from the central nervous system.

Submitted on March 14, 1962






© The Company of Biologists Ltd 1962