A decrease in sodium ion concentration in the blood will increase the release of aldosterone from the adrenal glands.
The adrenal glands, which are located above the kidneys, create aldosterone in the outer region (cortex) of the glands. In order to increase the amount of salt (sodium) reabsorbed into the bloodstream and the amount of potassium excreted in the urine, it acts on organs like the kidney and colon. This plays a key role in the regulation of blood pressure.
Aldosterone also causes sodium and water to be reabsorbed; this raises blood volume and, in turn, blood pressure. Excess synthesis of aldosterone, typically from a small benign adrenal tumour, is the most prevalent cause of high aldosterone levels (primary hyperaldosteronism). Addison's illness is an uncommon ailment that is characterised by low levels of aldosterone.
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