Neurotransmitters play a critical role in transmitting signals across the synapse between neurons. Each neurotransmitter has unique functions and mechanisms that can influence various behaviors and physiological processes. One common neurotransmitter associated with pleasure and reward is dopamine. Understanding the role of neurotransmitters is essential for grasping how certain drugs can mimic or alter their effects in the brain.
Which of the following neurotransmitters is primarily associated with the modulation of mood, emotion, and the regulation of sleep and appetite?