What is ment by hormone?
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A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. Many hormones are secreted by special glands, such as thyroid hormone produced by the thyroid gland. ... Many hormones, such as neurotransmitters, are active in more than one physical process.
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a regulatory substances produced in an organisms and transported in tissue fluids such as blood or sap to stimulate specific cell or tissues into action
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