a female hormone secreted by the ovary. Produced in large quantities by the placenta during pregnancy.
One of the female sex hormones; it helps regulate the menstrual cycle
A primary female sex hormone produced by the corpus luteum that induces secretory changes in the glands of the endometrium. Progesterone may also be given by injection or in the form of vaginal suppositories to enhance implantation and reduce the risk of miscarriage.