Abstract
The effect of a change in potassium ion concentration in the region of the basal membranes of the ampullae of Lorenzini of the thornback ray on spontaneous and evoked discharges of the receptors was investigated. A decrease in potassium ion concentration in the solution of perfusion with potassium-free solution led to a decrease in firing rate. Conversely, an increase in the potassium ion concentration caused an increase in discharge frequency followed by a decrease; thresholds of the receptors to the action of electrical stimuli were unchanged. When synaptic transmission was blocked by magnesium ions, an increase in the potassium ion concentration did not cause the appearance of activity in nerve fibers. If, however, activity of the nerve fibers in solution with a high magnesium ion concentration was restored with L-glutamic acid (10−4 M), an increase in the potassium ion concentration caused an increase in firing rate. The role of potassium ions in the activity of receptors of the lateral-line system is discussed.
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