Many neurotransmitter receptors are chemically activated ion channels known as:

A) ligand-gated channels.
B) metabotropic channels.
C) voltage-gated channels.
D) G protein-coupled channels.
E) neurotransmitter-selective channels.

Ligand-Gated Channels

Ion channels in cell membranes that open or close in response to the binding of a specific signaling molecule (ligand), allowing ions to pass across the membrane.

Metabotropic Channels

Metabotropic Channels refer to a type of membrane receptor in cells that acts through a second messenger system, ultimately affecting other ion channels or cellular processes.