Placental Function 1. EXchange of Metabolites: nutrients antibody waste 2. Defense barrier 3. hormone production human chorionic gonadotropin(HCG) Begin end of 2nd week Highest: 2nd month Estrogen and progesterone Placental lactogenPlacental Function 1.Exchange of Metabolites: nutrients antibody, waste 2.Defense barrier 3.hormone production ▪ human chorionic gonadotropin (HCG) Begin: end of 2nd week Highest: 2nd month ▪ Estrogen and progesterone ▪ Placental lactogen