* Produced by specialized cells: Hormones are created by specific glands or tissues in the body, often called endocrine glands.

* Secreted into the bloodstream: Once produced, hormones are released directly into the bloodstream, allowing them to travel throughout the body.

* Target specific cells: Hormones don't act on every cell in the body. They only affect cells that have specific receptors for that particular hormone. This is like a "lock and key" system, where the hormone is the key and the receptor is the lock.

* Act as chemical messengers: Hormones act as messengers, carrying information from one part of the body to another. They can regulate a wide variety of bodily functions, including growth, metabolism, mood, and reproduction.

* Work in small amounts: Hormones are highly potent, and only tiny amounts are needed to have a significant effect on the body.

* Regulated by feedback mechanisms: The body maintains a delicate balance of hormones. This is achieved through feedback mechanisms, where the hormone itself or its effects can trigger changes in its production, ensuring that levels remain within a healthy range.

While all hormones share these general features, they vary widely in their structure, function, and mechanism of action.