Types of Hormones C)G pr 第二信使学说 AMP Cellular changes (a)Body fluids carry nonsteroid hormone molecules to the target cell,where they combine (b)with aaasacr sites on the cell membrane.[c)In some und adenylate 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