Neurotransmitters

Acetylcholine

A cholinergic neurotransmitter involved in excitatory and inhibitory signaling.

Nicotinic Receptors

Excitatory receptors for acetylcholine
Can be blocked by curare.

Muscarinic Receptors

G-protein gated receptors for acetylcholine that can be either excitatory or inhibitory.
open K channels

Monoamines

biogenic amines

Serotonin

A biogenic amine neurotransmitter with excitatory and inhibitory effects in the CNS and PNS.

5-HT2 Receptors

Excitatory serotonin receptors that are G-protein-gated.

5-HT3 Receptors

Excitatory serotonin receptors that are ligand-operated.

5-HT1 Receptors

Inhibitory serotonin receptors that act as second messengers.

Emetic

Can cause vomiting
Serotonin chemical

Dopamine

A biogenic amine neurotransmitter with both excitatory and inhibitory receptors.

D1 Receptors

Excitatory dopamine receptors.

D2 Receptors

Inhibitory dopamine receptors associated with Parkinson's disease.

Norepinephrine

A biogenic amine neurotransmitter with excitatory and inhibitory effects.

a1 and B1 Receptors

Excitatory norepinephrine receptors that can increase heart rate.

B2 Receptors

Inhibitory norepinephrine receptors.

Amino Acids

amino acid neurotransmitter

Glutamate

An excitatory amino acid neurotransmitter.

Aspartate

An excitatory amino acid neurotransmitter.

GABA

An inhibitory amino acid neurotransmitter that helps regulate muscle movement.

Glycine

An inhibitory amino acid neurotransmitter that allows muscle movement by inhibiting opposing muscles.

Peptides

Neuropeptides

Substance P

An excitatory neuropeptide involved in pain signaling.

Endorphins

Inhibitory neuropeptides that block pain and induce euphoria.

Gases

Gasotransmitters

Nitric Oxide

An excitatory gasotransmitter involved in neural transmission.

Carbon Monoxide

An inhibitory gasotransmitter that influences neuronal activity and muscle relaxation.

Lipids

Endocannabinoids

Inhibitory Lipids

Act as retrograde inhibitors.

CB1 Receptor

An endocannabinoid inhibitory receptor that THC binds to, causing relaxation and changes in appetite.