In this veo we can appreciate the receptors and its types involved in drug interaction with the system . TIMELINE: 0:01 Introduction 0:15 Ligand gated ion channels 0:53 G-protein coupled receptors(GPCRs) 1:43 Adenylyl cyclase ( secondary messenger system) 1:57 Enzymes linked receptors 2:47 Intracellular receptors 3:05 Conclusion