A hormone is a chemical messenger from one cell (or group of cells) to another.
All multicellular organisms produce hormones including plants.
The best-known animal (and human) hormones are those produced by endocrine glands of vertebrate animals, but hormones are produced by nearly every organ system and tissue type in a human or animal body..
For more information about the topic Hormone, read the full article at Wikipedia.org, or see the following related articles:
Endocrine system The endocrine system is a control system of ductless glands that secrete chemical messengers called hormones that circulate within the body via the ... >
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Pituitary gland The pituitary gland, or hypophysis, is an endocrine gland about the size of a pea that sits in the small, bony cavity at the base of the brain. The ... >
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Anterior pituitary The anterior pituitary (also called the adenohypophysis) comprises the anterior lobe of the pituitary gland and is part of the endocrine system. ... >
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Human physiology Human physiology is the science of the mechanical, physical, and biochemical functions of normal humans or human tissues or organs. The principal ... >
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