The menstrual cycle is a process that uninseminated human women go through about every 28 days. During this time, the women's ovaries create a mature
The menstrual cycle process is controlled by four major
The menstrual cycle has three stages: the Follicular stage, Ovulation, and the Luteal (or premenstrual) stage. The cycle will stop if the woman gets pregnant (if a fertilized egg implants itself into the lining of the uterus).
This stage is the start of the menstrual cycle, and is counted as day one of the cycle. This stage starts when the amount of progesterone and estrogen in a woman's
At the start of this stage, the pituitary gland will begin to release more FSH. This will continue for 3-4 days. The FSH makes several
follicles grow in one of the
Usually, the amount of FSH in the body peaks during the third or fourth day of menstruation. All but one of the follicles dies off. The one that is left releases even more estrogen. Once again, the lining of the uterus thickens. Near the end of the stage, a woman's estrogen levels peak. This causes the pituitary gland to release LH, which also peaks at this time.