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The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. They are found above the kidneys and consist of a series of layers with different structure and functions. Each gland has an outer cortex which produces steroid hormones and an inner medulla. The adrenal cortex itself is divided into three zones: zona glomerulosa, the zona fasciculata and the zona reticularis. The adrenal cortex produces a class of steroid hormones called corticosteroids, named according to their effects.
Adrenal Stress Index. The adrenal glands are two tiny organs that reside just above the kidneys. Each one weighs about as much as a walnut, but they have a key role in regulating the body's metabolism. Each adrenal gland has two functional zones that have unique jobs in the body. The outer cortex secretes adrenal steroids (Cortisol, DHEA, and Aldosterone). The inner medulla secretes adrenaline and noradrenaline. Cortisol, DHEA, and adrenaline are the three main adrenal stress hormones.