Abstract
The classical theory of sodium metabolism considers mostly its role on the extracellular volume according to a daily response to the variations of salt intake, correlated to the variations of water volume. Recent works consider sodium tissular storage. This non-osmotic pool could play a role in blood pressure regulation and in immunity mechanisms. The regulation modalities could be more complex, organised over the long term, with a modification of the sodium-water relationship. The aim of this article is to give a new insight on sodium metabolism, based on recent works, especially on the role and regulation of non osmotic tissular sodium.
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