What change in hormones allows menstruation to
occur?
What change in hormones allows menstruation to
occur?
Solutions
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).
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