Aldosterone is a mineralcoritcoid and a hormone. It allows the transport of sodium across the cell membrane. This is especially important in the kidney (distal tubule). Because of its function, aldosterone is important in blood pressure regulation and also for the volume of blood found in the blood vessels. Potassium is an antagonist to sodium. If potassium is high, sodium levels will be low. When potassium is found high in the plasma of the blood, the adrenals step in and synthesize aldosterone. The synthesis of aldosterone is taken care of in the body primarily by the renin-angiotensin system.
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