1
Inhibitory; Responsible for feelings of fear and anxiety, memory, appetite, sexual behavior
2
Excitatory; Both a neurotransmitter and a hormone, increases blood flow and oxygen
3
Excitatory; Involved in thought, learning, and memory, associated with the fight or flight response
4
Excitatory; Both a neurotransmitter and a hormone, increases energy production
5
Inhibitory; Reduces pain; released during exercise, excitement, and sex
6
Inhibitory; Responsible for feeling calm, regular sleep cycle, appropriate function of the digestive system
7
Excitatory; Most common brain neurotransmitter, involved in learning, creates nerve contacts
8
Excitatory; Responsible for feelings of enjoyment and pleasure, memory, focus, and problem solving
9
Inhibitory; Calms firing nerves in CNS. High levels improve focus, low levels cause anxiety.
