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A hormone is a chemical substance that is made in one part of the body, then acts like a messenger molecule as it travels to other parts of the body where it helps regulate how cells and organs function. The hormone is secreted into the blood by a gland in response to a signal from the brain. Hormones include the hormones of the thyroid gland (Triiodothyronine (T3) and Thyroxine (T4),
