The hormone epinephrine causes opposite effects in two populations of target cells because . See Concept 45.1 (Page 999) View Available Hint(s) The hormone epinephrine causes opposite effects in two populations of target cells because . See Concept 45.1 (Page 999) the chemical form of epinephrine released by neurons is different from the epinephrine released by endocrine cells epinephrine crosses the membrane on one set of target cells but binds to membrane-bound receptors in the other set of target cells epinephrine activates biochemical pathways in one set of target cells but works only by changing gene expression in the other set of target cells epinephrine can only reach target cells in adipose tissue, as it is fat-soluble each set of target cells has different receptor-transduction mechanisms