Which neurotransmitter is known as an excitatory agent associated with mood arousal?

Norepinephrine is recognized as an excitatory neurotransmitter that plays a significant role in mood regulation and arousal. It is involved in the body’s stress response and functions as a key component of the sympathetic nervous system, which is responsible for the 'fight or flight' reaction. Increased levels of norepinephrine can lead to enhanced alertness, focus, and energy, contributing to a heightened mood state.

This neurotransmitter is linked to various psychiatric conditions, such as depression and anxiety disorders. In situations where norepinephrine is deficient, individuals may experience symptoms such as fatigue, low mood, and cognitive impairments. Therefore, understanding the function of norepinephrine gives insight into its importance in both normal physiological functioning and in the context of mental health issues.

The other neurotransmitters listed contribute to various aspects of mood and cognitive function, but norepinephrine is particularly noted for its role in arousal and the stimulation of alertness in relation to mood.