Abstract
Fluid bathing an isolated crab pericardial organ was assayed on the isolated, perfused crab heart in order to follow release of heart excitatory neurosecretory material in response to electrical stimulation. The propagated, compound action potential produced by stimulation was monitored extracellularly from the neurohemal structure. When calcium is omitted from the bathing saline, release of neurosecretory material is reduced to the unstimulated level. However, the compound potential is not depressed.
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