Me , the similarities between the nervous and endocrine system are exemplified by adrenalin (also called epinephrine). adrenalin is an amino acid-based hormone, but it (along with norepinephrine) is also a neurotransmitter in the sympathetic nervous system. in both systems, adrenalin binds with membrane-embedded receptors, which causes a response in the interior of the cell. is adrenalin's dual role an advantage or disadvantage? why or why not?