What change in hormones allows menstruation to occur?

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Expert Solution

Menstrual cycle has four phases :

Menstrual phase - this phase is also called as bleeding phase. The level of oestrogen and progesterone drops because of which bleeding occurs in which endometrial tissue sheds with mucus and blood.
Follicular phase - also called as proliferative phase. The follicles in the ovary gets mature in this phase, with the increase in level of FSH and gonadotropin-releasing hormone. The level of estrogen also increases.
Ovulatory phase - in this phase the ovulation occurs. There is a peak increase in LH level also called as LH surge. Because of the increase in luteinizing hormone (LH) the graafian follicle gets ruptured and ovary is released.
Luteal phase - the level of progesterone increases with a little increase in estrogen. The increased progesterone keeps the the uterine lining thick and makes it ready for the implantation of fertilized egg (if fertilization occurs).

Sydney Mullin answered 9 months ago

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