Final answer:
The neuroendocrine system operates by releasing hormones into the bloodstream, which then travel throughout the body to target cells with appropriate receptors.
Step-by-step explanation:
The neuroendocrine system functions by releasing chemicals called hormones. Hormones, unlike neurotransmitters that are released in close proximity to cells with their receptors, are secreted into the bloodstream and travel throughout the body. They have widespread effects, are slower to take effect, and tend to be longer lasting compared to neurotransmitters. For instance, the adrenal medulla releases epinephrine and norepinephrine into circulation, classifying them as hormones.