1. Co-existence of amine and/or peptide transmitters in the vast majority of neurons.

2. Neurotransmitter

3. Neuropeptides
Peptites
Neuropeptides are small protein-like molecules (peptides) used by neurons to communicate with each other

4. Neuropeptides modulate neuronal communication by acting on cell surface receptors. Many neuropeptides are co-released with other small-molecule neurotransmitters.
peptides are not recycled back into the cell once secreted

5. Catechol
Adrenaline
Noradrenaline
Dopamine

6. Involved in:
sleep and wakefulness,
attention, and feeding behavior,
as well as a stress hormone released by the adrenal glands that regulates the sympathetic nervous system.
Norepinephrine

7. adrenal stress hormone,
as well as a neurotransmitter
present at lower levels in the brain.
Epinephrine

8. Involved in:
motivation, reward, addiction,
behavioral reinforcement,
and coordination of bodily movement.
Dopamine