(i) Corpus luteum secretes large amounts o{ progesterone and some small amount of estradiol hormone. Both these hormones are essential for the maintenance of the endometrium which is necessary for the implantation of fertilised ovum. It also inhibits the release of FSH so that it may not develop additional follicles and eggs.
Placenta secretes human placental lactogen which ensures energy,v supply to the foetus by modifying the metabolism of the mother during pregnancy. It has anti-insulin property which reduces the maternal insulin sensitivity there by increasing the level of blood glucose. It also secretes Human chorionic gonadotropin (hCG) hormone. It maintains the corpus luteum in the pregnancy and stimulates the release of progesterone.
(ii) Gonadotropins like LH and FSH are secreted during follicular phase. They stimulate the follicular development as well as secretion of estrogens by the growing follicles. During parturition, oxytocin is released which leads to the contraction of smooth muscles of myometrium of the uterus and directs the full term foetus towards the birth canal.
