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  • Title: Electrical Activity in Single Myocardial Cells of Limulus polyphemus.
    Author: McCann FV.
    Journal: Science; 1962 Aug 03; 137(3527):340-1. PubMed ID: 17740811.
    Abstract:
    Single cells of the heart of Limulus were examined in situ with conventional microelectrodes. Resting and action potentials were measured in a total of 20 animals, with 25 penetrations per heart during normal spontaneous activity. Resting-potential values averaged 45 millivolts. Action potentials showed a rapid upstroke and a prolonged plateau. A small, irregular burst of electrical activity occurred during the plateau phase, a discharge presumably associated with the "neurogenic" character of the heartbeat. There was no significant overshoot, nor was there any topographical localization of action-potential "types.".
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