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How does aldosterone help control salt, water, and blood pressure?

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human endocrine system The principal glands of the female and male human endocrine systems.

Aldosterone is a steroid hormone produced by the adrenal glands that acts as the body's primary regulator of salt and water balance.1

Its function is controlled by the renin-angiotensin system, which monitors blood pressure and fluid levels. When the body detects low blood pressure or decreased blood flow to the kidneys, the kidneys release the enzyme renin. This initiates a chemical cascade that produces angiotensin II, which in turn stimulates the adrenal glands to secrete aldosterone.12

Once released, aldosterone travels to the kidneys and binds to receptors in the renal tubular cells. This process triggers two main effects:
* Sodium and Water Retention: It stimulates the reabsorption of sodium into the blood, which causes water to follow, thereby increasing blood volume and pressure.13
* Potassium Excretion: It promotes the excretion of potassium into the urine.13

By managing these electrolyte levels and fluid volume, aldosterone plays a critical role in maintaining cardiovascular stability and systemic blood pressure.23