- Ionotropic Receptor: An ionotropic receptor is a type of receptor that is a ligand-gated ion channel, meaning that when a neurotransmitter binds, the channel opens directly to allow ions to flow across the membrane.
- Metabotropic Receptor: A metabotropic receptor is a type of receptor that is not an ion channel itself but initiates a series of intracellular signaling events, often via G proteins, when a neurotransmitter binds.