Which of the following neurotransmitters is involved in activating the sympathetic nervous system for fight-or-flight responses?

Question

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Norepinephrine is released by the sympathetic nerves and triggers the fight-or-flight response by increasing heart rate, blood pressure, and respiratory rate. Serotonin is involved in regulating mood, appetite, and sleep. Dopamine is involved in reward and pleasure. Monoamine oxidase is an enzyme that breaks down monoamine neurotransmitters in the brain.

Which of the Following Neurotransmitters Is Involved in Activating the Sympathetic