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Considered both a neurotransmitter and a hormone; plays a role in mood regulation, emotional bonding, and appetite.

Neurotransmitter that modulates sleep, arousal, appetite, and mood.

Helps to regulate pain, but in the form of peptides called enkephalins.

Involved in muscle movement and cognitive processes related to learning and memory.

Involved in reward, motivation, and addiction; plays a key role in attention and executive functions.

Important for regulating mood, appetite, and sleep. Also involved in cognition, reward, learning, and memory.

Modulates the immune response and affects learning and memory processes.

Implicated in pain perception, natural analgesia, and reward mechanisms.

Key in the 'fight or flight' response and plays a role in the intellectual assessment of potential threats.

Neurotransmitter that can have neuroprotective properties and is linked to appetite regulation.

A major excitatory neurotransmitter involved in learning, memory, and neural processing.

Plays a vital role in the regulation of emotions and pain, as well as cognitive and neuroendocrine functions.

Contributes to mood regulation, pain perception, and the stress response.

Main inhibitory neurotransmitter in the brain; facilitates calmness and relaxation.