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In page Sweat test:

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Sweat glands produce sweat through a well understood process of secretion and reabsorption of sodium chloride (salt). Secretion entails the movement of salt and water from sweat gland cells into the sweat duct. Reabsorption occurs in the duct with the movement of salt from the sweat back into sweat duct cells. What remains is sweat, a salt solution with a relatively finely tuned concentration of sodium and chloride.[citation needed]