Abstract
1. 1. One of the pair of pericardial organs (PO's) of Libinia emarginata was removed to a chamber and arranged for simultaneous electrical stimulation and recording. Fluid bathing the PO was assayed for excitatory effect on the isolated, perfused crab heart. 2. 2. A low level of spontaneous release of excitatory material and spontaneous electrical activity, interpreted as action potentials in one or a few axons, were observed in many PO's. 3. 3. A high rate of release of active material was observed only when stimulation resulted in a compound action potential showing a large component representing fibers of 1 4 to 1 2 m/sec conduction velocity. 4. 4. This electrical component and release of excitatory material showed the same threshold and optimal values of stimulus voltage, and the same maximum, 10/sec, for response to repetitive stimulation. 5. 5. The excitatory effect of the fluid was proportional to the number of stimuli given. 6. 6. It is concluded that action potentials propagated in axons of neurosecretory cells result in release of neurosecretory material from the terminals.
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