Tpes of hormones 6- Hormon mbrane meocecuce Hormone Adenylate recepto c)G protein 第二信使学说 inases Protel kinase substrate (active (inactive) Cytoplasm Nucleus Substrate (active) Cellular changes 3 (a] Body fluids carry nonsteroid hormone molecules to the target cell, where they combine[b]with eceptor sites on the cell membrane. (c) In some cases, via a g protein, this activates molecules of membrane- bound adenylate cyclase, which [d] catalyze conversion of ATP into cyclic adenosine monophosphate (cAMP). [e] The cAMP promotes a series of reactions leading to the cellular changes associated with the hormone 's action. The g protein and adenylate cyclase enzyme are actually embedded in the cytoplasmic surface of the cell membrane第二信使学说