Final answer:
The endocrine system is a collection of glands that secrete chemical messages called hormones. These hormones travel through the bloodstream to target cells with receptors for them, playing a crucial role in body regulation.
Step-by-step explanation:
The endocrine system is a collection of glands that secrete chemical messages we call hormones. These hormones are released into the bloodstream and travel throughout the body to target cells that have receptors for them. The endocrine system plays a crucial role in regulating various body functions, including metabolism, growth, and sexual development.