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A chemical signal that has both endocrine and neural roles is?

1. Calcitonin
2. Epinephrine
3. Cortisol
4. Melatonin

Correct answer: Epinephrine

Solution

Epinephrine functions as a hormone when released into the bloodstream from the adrenal medulla, and it also participates in neural signaling in the sympathetic nervous system. That dual role makes it the best choice.

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