Acetylcholine

Synaptic gap

Acetylcholine

Norepinephrine (NE) is the neurotransmitter often associated with the "fight or flight" response to stress. Strongly linked to physical responses and reactions, it can increase heart rate and blood pressure as well as create a sense of panic and overwhelming fear/dread. This neurotransmitter is similar to adrenaline and is felt to set threshold levels to stimulation and arousal. Emotionally, anxiety and depression are related to norepinephrine levels in the brain, as this neurotransmitter seems to maintain the balance between agitation and depression.

A neurotransmitter that causes muscle movement is called Acetylcholine. Acetycholine acts as on both the central nervous system and the peripheral nervous system.