Essential oils work by «waking up» certain receptors in the brain, and thus having a healing effect on the body, both emotionally and physically. (golubkakitchen.com)
Only certain molecules, one theory holds, have the right shape to latch onto certain receptors. (discovermagazine.com)
The possibility grows out of the properties of certain receptors for the neurotransmitter acetylcholine, called «muscarinic acetylcholine receptors.» (emoryhealthsciblog.com)