Hormone. Definition

Medical Definition: Hormone

One of the many specialized action chemicals produced by glands in the body. Hormones act as messengers circulating in the bloodstream and control the actions of certain cells or organs located anywhere in the body, in cells that respond to stimuli that cause. Some hormones can also occur in the laboratory. The difference between the hormones of animals and plants is that the former are produced in specific organs and regulate almost all physiological functions.

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