Final answer:
Serotonin is related to the modulation of mood and impulse control, making the statement true.
Step-by-step explanation:
True. Serotonin is a neurotransmitter that is related to the modulation of mood and impulse control. It plays a key role in regulating emotions and behaviors, and alterations in serotonin function have been implicated in various clinical conditions, including affective disorders and anxiety states.