Explanation

Endocrine Functions of Placenta Placenta secretes some hormones such as oestrogen, progesterone, human Chorionic Gonadotropin ($hCG$), human Chorionic Somato-mammotropin ($hCS$), Chorionic thyrotrophin, chorionic corticotropin and relaxin. $hCS$ was formarly known as human placental lactogen. The hCG stimulates and maintains the corpus luteum to secrete progesterone until the end of pregnancy. The hCS stimulates the growth of the mammary gland during pregnancy. Relaxin facailitates parturition (act of child birth) by softening of the connective tissue of the pubic symphysis