What are considered not true neurotransmitters?

Answer 1

Not all molecules that act as neurotransmitters in the brain are considered "true" neurotransmitters. Some molecules, like gases (e.g., nitric oxide), lipids (e.g., endocannabinoids), and peptides (e.g., endorphins), can also act as neurotransmitters but are not classified as traditional neurotransmitters like dopamine or serotonin due to their unique chemical properties and modes of action. These non-traditional neurotransmitters play important roles in modulating neural signaling and can have significant effects on behavior and physiology.

Answer 2

Not all chemical messengers in the brain are classified as true neurotransmitters. Some examples include neuropeptides, endocannabinoids, and gasotransmitters like nitric oxide. These substances modulate neural activity and play important roles in brain function, but they differ from classical neurotransmitters in their structure or mode of action.

Answer 3

Any chemical that imitates the chemical reactions of neurotransmitters in the brain. Examples of these include octopamine and 5-methoxy-?-methyltryptamine.