Summary
Afferent responses in single-fibre and multi-fibre preparations from isolated ampullae of Lorenzini to various concentrations of ionic calcium (from 0.2 g/l to 5.0 g/l) were investigated in the dogfish (Scylliorhinus canicula).
At constant temperature (12.3° C), calcium concentrations between 0.2 and 1.6 g/l were practically ineffective. Concentrations between 1.8 and 5.0 g/l inhibited the static impulse discharge for time periods up to several minutes depending on the calcium charge. Concentration and diffusion parameters were decisive for the amount as well as the temporal course of this inhibition. Additional thermal or mechanical stimulation led to an answer superimposed on the effects of calcium. Calcium-free fluids produced a slight increase in average impulse rate.
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This investigation was supported by grant from the Deutsche Forschungsgemeinschaft.
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Nier, K., Hensel, H. Effects of calcium on afferent responses of the ampullae of Lorenzini. Pflugers Arch. 338, 281–287 (1973). https://doi.org/10.1007/BF00586069
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DOI: https://doi.org/10.1007/BF00586069