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Aldosterone, like ADH also acts on the distant tubules, but also at the kidneyâs collecting ducts. Water retention with the aid of aldosterone is more complex because it has to undergo the Sodium-Potassium exchange channels. In this set-up, potassium is excreted while sodium is retained.
Aldosterone is a steroid hormone (mineralocorticoid family) produced by the outer section (zona glomerulosa) of the adrenal cortex in the adrenal gland. Aldosterone stimulates the secretion of K + into the tubular lumen. 2  Aldosterone stimulates Na + and water reabsorption from the gut, salivary and sweat glands in exchange for K + .