| Section2 = | Section3 = }} Aldosterone's a hormone that increases the reabsorption of sodium and water and the release (secretion) of potassium in the kidneys. This increases blood volume and therefore, increases blood pressure. Many drugs, such as spironolactone, lower blood pressure by blocking the aldosterone receptor. Aldosterone's part of the renin-angiotensin system. Aldosterone's a steroid hormone (mineralocorticoid family) produced by the outer-section (zona glomerulosa) of the adrena… (More on Aldosterone)