However, during the luteal phase following ovulation, a large amount of progesterone is produced in the ovaries, coming from the corpus luteum. It is reported that the contribution of the ovaries to the blood plasma levels of progesterone is small during this phase of the menstrual cycle. In the follicular phase preceding ovulation, the majority of progesterone is produced by the adrenal glands. The hormone's major responsibility it to thicken the endometrial lining in preparation to nourish an egg in case conception has occurred.Īfter conception, progesterone helps establish the placenta stimulates development of breast tissues prevents lactation and strengthens pelvic walls in preparation for giving birth.Įven after reproductive years, progesterone will still be produced, but the hormone will acquire different roles in effort to maintain a healthy hormonal balance. Progesterone is a vital hormone for the menstrual cycle and pregnancy.
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