Characteristics of hormone ◆ Specificity Extracellular Receptor ligand fluid complex ◆ Signaling Membrane ◆ High effective Intracellular ○OO ◆ Cooperation OOOOOOOOOOOOOOOOoO One ligand is amplified into many intracellular moleculesCharacteristics of hormone Specificity Signaling High effective Cooperation