Abstract
A general method for analyzing ion transport in a system of complex geometry has been used to study the secretory activity of theLimonium salt gland. On the basis of an electron-microscopical study of the cells and their arrangement, a simple model has been set up which predicts qualitatively the changes in inhibitor-sensitive ion fluxes under a range of positive and negative voltage clamps. Comparison with experimental data indicates that sodium ions, although transported against an overall electrochemical gradient, are not pumped in this system but electrically coupled to chloride transport inside the gland complex. The basis of the electrical activity, the salt transport, and the volume efflux from these cells is therefore an electrogenic chloride pump.
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