(Dysregulation of Ongoing Cellular Activity) 1) Dysregulation of Electrically Excitable Cells RECEPTOR FUNCTION 1 Some chemicals interact directly with neurotransmitter receptors, These are:

. 1) Agonists that associate with the ligand binding site on the receptor and MIMIC THE NATURAL LIGAND, 2) Antagonists that occupy the ligand binding site but CANNOT ACTIVATE THE RECEPTOR, (3) Activators, 4 Inhibitors that bind to a site on the receptor that is NOT DIRECTLY INVOLVED IN LIGAND BINDING.