One of a pair of glands located above each kidney that secretes hormones directly into the bloodstream. Each gland has two parts that perform different functions. 1. The adrenal cortex produces and secretes hormones such as cortisol, aldosterone and sex steroids. They are involved in many different body functions. 2. The adrenal medulla produces and secretes catecholamines such as adrenaline (epinephrine) and norepinephrine.