Plasma aldosterone

Plasma aldosterone (Ald) is an important mineralocorticoid secreted by the adrenal cortex globular band, and has physiological functions of regulating sodium and potassium metabolism and extracellular fluid volume. Ald is mainly regulated by the renin-angiotensin system, sodium, potassium levels in the body, ACTH, adrenergic and dopaminergic systems, and blood volume and other factors all have a regulating effect on aldosterone secretion. Ald exists in free form in the blood circulation from 30% to 40%, and about 6% of unmetabolized aldosterone is excreted from the urine.