If you were to drink a liter of distilled water in one go, your blood Na+ levels may drop below setpoint. To bring Na+ levels back up, the ______________ releases____________, which tells the kidneys to reabsorb Na+. posterior pituitary gland........aldosterone adrenal cortex.......aldosterone posterior pituitary gland........anti-diuretic hormone (ADH) adrenal cortex.......anti-diuretic hormone (ADH)