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The suprarenal glands, also known as adrenal glands, belong to the endocrine system. They are a pair of triangular-shaped glands, each about 2 in long and 1 in wide, that sit on top of the kidneys (see the image below).
Save. The adrenal glands sit on top of each kidney producing stress hormones called corticosteroids. There are two parts of the adrenal and each produces different substances that affect heart rate, salt levels and blood pressure. Overactive adrenals can lead to adrenal exhaustion.ach gland is located directly on top of a kidney. The inner part of the adrenal gland is called the medulla. The outer part is called the cortex.