Neurotransmitters attach to cell receptors--proteins designed to chemically bind with specific sets of neurotransmitters. Psychiatric drugs take advantage of this architecture to artificially trigger receptors with a chemical that simulates the natural neurotransmitter.
In neuromythography we call receptors Receivers, an allusion to radio antenna. This emphasizes that they are receiving Energies representing information channels with intrinsic meaning, and interpreting them. Receivers are expressed on Brain Areas.