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Hormone definition, Biochemistry. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues when transported to them by the body fluids. Pharmacology. a synthetic substance used in medicine to act like such a compound when introduced into the body.
Define hormone. A chemical (protein, steroid or amine) produced by the endocrine gland that is transported via the blood to the body where it has the ability to effect all the bodily cells or target cells/organs.efine hypothalamus. Part of the brain that links the endocrine system and the nervous system and regulates the pituitary gland whilst regulating basic functions of the body; temperature, water balance, food intake and controls/intigrates the autonomic nervous system.