What hormone is produced by the blastocyst?

The hormone produced by the blastocyst is human chorionic gonadotropin (hCG). hCG is a glycoprotein hormone that is produced by the trophoblast cells of the blastocyst. It is responsible for maintaining the corpus luteum, which is a small gland that forms on the ovary after ovulation. The corpus luteum produces progesterone, which is a hormone that is essential for the maintenance of pregnancy. hCG also stimulates the production of estrogen, which is another hormone that is important for pregnancy.