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[[Image:Adrenaline.png|thumb|Adrenaline - Chemical structure]]
A chemical messenger that signals to specific cells to change their behavior in specific ways. Hormones are secreted into the [[bloodstream]] through endocrine [[gland]]s, part of the [[endocrine system]]. Ensuing are a few significant examples:
A chemical messenger that signals to specific cells to change their behavior in specific ways. Hormones are secreted into the [[bloodstream]] through endocrine [[gland]]s, part of the [[endocrine system]]. Ensuing are a few significant examples: