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Journal of Experimental Biology 38,737-746 (1961)
Published by Company of Biologists 1961

The Kinetics of Sodium Transfer in the Central Nervous System of the Cockroach, Periplaneta Americana L

J. E. TREHERNE ¹

¹ A.R.C. Unit of Insect Physiology, Department of Zoology, University of Cambridge

1. The exchange of sodium ions in the cockroach central nervous system has been studied by following the escape of ²⁴Na from isolated abdominal nerve cords, single connectives and ganglia. Particular attention was paid to the initial rapid exchanges of sodium.

2. The escape of sodium ions occurred as a two-stage process, an initial rapid phase eventually giving way to a slower exponential phase of sodium loss. The fast phase of efflux was not affected by the presence of 2:4-dinitrophenol, although this poison significantly reduced the second slow phase of sodium extrusion.

3. The initial fast phase is attributed to a rapid diffusion from an extracellular space, demonstrated by ¹⁴C-inulin; the second phase is identified as the slower extrusion from the cellular components of the central nervous system.