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Endocrinology

At its simplest, a hormone is a chemical messenger from one cell (or group of cells) to another. Hormones are released (secreted) in the body and have an effect on other parts of the body. The effect is to communicate with possibly distant parts of the body. So for example, the adrenal glands may secrete adrenalin, which has an effect on several different organs. An endocrine gland is a gland which secretes hormones (note that not all glands are classified as endocrine glands; for example, sweat glands or lymph glands are not endocrine glands).