So it has many important functions and one of the most important functions is the maintenance of the endometrium. So it's the estrogen that generates and thickens that endometrium, but it's progesterone that maintains the endometrium as our ovum travels through the fallopian tube and during the process of pregnancy. So progesterone is used to maintain the endometrium during the menstrual cycle as well as during pregnancy if the sperm actually combines with our egg. Now, it also inhibits the process of lactation during pregnancy and it also decreases the ability of the smooth muscle inside the uterus to basically contract. And this is important because we don't want our muscles in the uterus to contract too early during the process of pregnancy. So this is our ovary.