Aldosterone is a '''steroid hormone''' which is secreted from the '''zona glomerulosa''' of the adrenal gland. It has a mineralocorticoid activity and is the most important regulator of plasma potassium. When plasma potassium increases, increased stimulation of aldosterone occurs directly and also as a result of the [[Renin Angiotensin Aldosterone System|Renin-Angiotensin-Aldosterone System (RAAS)]]. Aldosterone is also the most important regulator of sodium excretion. | Aldosterone is a '''steroid hormone''' which is secreted from the '''zona glomerulosa''' of the adrenal gland. It has a mineralocorticoid activity and is the most important regulator of plasma potassium. When plasma potassium increases, increased stimulation of aldosterone occurs directly and also as a result of the [[Renin Angiotensin Aldosterone System|Renin-Angiotensin-Aldosterone System (RAAS)]]. Aldosterone is also the most important regulator of sodium excretion. |