This video delivers the complete information that you need is to understand the chemicals that are released from the adrenal medlla. It also explains the detailed mechanism of action of hormones along with the influence of the sympethatic nervous system. timeline: 0:07 introduction of adrenal medulla 1:27 primary stimulus of sympathetic nervous system 3:07 mechanism of sympethatic nervous system 12:20 epinephrine &NE effect on targeted cells(liver, Adipose tissue,cardiac muscles, skeleton muscles, Smooth muscles of bronchi)