Summary
The hypertonicity of the secretory fluid produced by the cat sweat gland is due to a potassium release mechanism which operates in series with an isosmotic NaCl transport process.
The potassium excretion rate is not coupled with volume flow but is determined by the frequency of electrical stimulation.
Evidence is presented for the presence of two potassium release mechanisms during the secretory process. A small potassium flux is due to cellular redistribution at the onset of stimulation potassium secretion perhaps originating from dark cells. The major potassium flux is related to the bicarbonate excertion rate.
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Slegers, J.F.G., Moons, W.M. Hyperosmotic secretion at low transport rates in the cat sweat gland. Pflugers Arch. 343, 49–63 (1973). https://doi.org/10.1007/BF00586574
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DOI: https://doi.org/10.1007/BF00586574