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What is a hormone?

hormones are chemical signals that are secreted into the cirulatory system and communicate regulatory messages within the body.

Why does a hormone elicit a response only with target cells?

A hormone may reach all parts of the body, but only specific target cells respond to specific hormones.

The body has two long-distance regulating systems. Which involves chemical signals by hormones?

endocrine system

What is the other major communication and control system?

nervous system

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