Endocrine glands release chemicals called hormones into the bloodstream.

Here's why this is important:

* Bloodstream as a delivery system: The bloodstream acts as a transportation network, carrying hormones throughout the body to reach their target cells and tissues.

* Specificity of action: Hormones are highly specific, meaning they only bind to and influence certain cells that have the appropriate receptors for them.

* Regulation of bodily functions: Hormones regulate a wide range of bodily functions, including growth, metabolism, reproduction, mood, and stress response.

Let me know if you'd like to learn more about specific endocrine glands or hormones!