<prompt> The role of human placental lactogen is:stimulate milk productionFetal breast developmentGrowth of fetusEndocrine regulation  <response>: HUMAN PLACENTAL LACTOGEN hPL: This is also known as human chorionic somatomammotropin hCS. It is synthesized by the syncytiotrophoblast of the placenta. The hormone is chemically and immunologically similar to pituitary growth hormone and prolactin. hPL in maternal serum is first detected during the 3rd week. The level rises progressively from 5 to 25 mgmL until about 36 weeks. Functions: hPL antagonises insulin action. hPL causes maternal lipolysis and promotes transfer of glucose and amino acids to the fetus. As a potent angiogenic hormone, it helps to develop fetal vasculature. It promotes growth of breasts for lactation. Reference: Duttas Textbook of Obstetrics 7th edition page no 60 