Which neurotransmitter is most closely linked to mood regulation and is a target of many antidepressants?

Which neurotransmitter is most closely linked to mood regulation and is a target of many antidepressants?

• A. Acetylcholine
• B. Serotonin
• C. Dopamine
• D. Glutamate

Answer: (B)

Serotonin plays a central role in mood regulation through its actions in emotion-related brain circuits such as the limbic system and prefrontal cortex. Its signaling helps balance emotions, anxiety, sleep, and appetite, and disruptions in serotonin pathways are linked to mood disorders. Many antidepressants work by increasing serotonin availability in the synapse, typically by blocking the serotonin transporter responsible for reuptake. This elevates serotonin levels where it can activate receptors and improve mood and related symptoms. Acetylcholine is more closely tied to attention and memory. Dopamine drives reward, motivation, and certain aspects of mood but is not the primary target for most antidepressants. Glutamate is the main excitatory transmitter and is involved in synaptic plasticity and rapid-acting antidepressant effects in some contexts, but the classic and most consistent antidepressant strategy centers on serotonin.

Serotonin plays a central role in mood regulation through its actions in emotion-related brain circuits such as the limbic system and prefrontal cortex. Its signaling helps balance emotions, anxiety, sleep, and appetite, and disruptions in serotonin pathways are linked to mood disorders. Many antidepressants work by increasing serotonin availability in the synapse, typically by blocking the serotonin transporter responsible for reuptake. This elevates serotonin levels where it can activate receptors and improve mood and related symptoms.

Acetylcholine is more closely tied to attention and memory. Dopamine drives reward, motivation, and certain aspects of mood but is not the primary target for most antidepressants. Glutamate is the main excitatory transmitter and is involved in synaptic plasticity and rapid-acting antidepressant effects in some contexts, but the classic and most consistent antidepressant strategy centers on serotonin.