BIPC Final Practice Exam

Norepinephrine helps regulate mood, arousal, and attention, so it ties together depression, ADHD, and anxiety. In depression, lower norepinephrine can contribute to low energy and mood, and treatments that boost its activity (like norepinephrine reuptake inhibitors) can help lift mood and energy. In ADHD, norepinephrine supports focus and executive control; many ADHD medications increase norepinephrine in the prefrontal cortex to improve attention and impulse control. In anxiety, heightened adrenergic activity drives arousal and worry, so dysregulated norepinephrine can worsen anxious symptoms. While other neurotransmitters like dopamine, GABA, and acetylcholine play roles in related functions, norepinephrine uniquely intersects mood, attention, and arousal in this trio, making it the best answer.