Final answer:
The endocrine system releases hormones into the bloodstream to regulate body functions.
Explanation:
The endocrine system is a system of glands that release chemical messenger molecules called hormones into the bloodstream. These glands include the pituitary gland, pancreas, pineal gland, thyroid, and parathyroid glands. Hormones are secreted into the blood and travel throughout the body, affecting cells with specific receptors for them.
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