| − | Aldosterone is a steroid hormone that stimulates increased reabsorption of Na+ cations and causes more K+ ions to be excreted into the bloodstream by the distal convoluted tubule (of the nephron in a kidney's cortex). | + | Aldosterone is a steroid hormone that stimulates increased reabsorption of Na+ cations and causes more K+ ions to be excreted by the distal convoluted tubule (of the nephron in a kidney's cortex). |