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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.
The adrenal medullaâthe inner part of the glandâproduces nonessential (that is, you donât need them to live) hormones, such as adrenaline (which helps your body react to stress). When you think of the adrenal glands (also known as suprarenal glands), stress might come to mind. And rightly soâthe adrenal glands are arguably best known for secreting the hormone adrenaline, which rapidly prepares your body to spring into action in a stressful situation.