Question

The graph shows the changing levels of hormones during menstruation and ovulation.

mc024-1.jpg

In general, what happens to the hormone levels between days 21 and 27, just prior to menstruation if the egg was not fertilized?
Hormone levels generally decrease.
Hormone levels generally rise.
Hormone levels remain the same.
Hormone levels go in two different directions.

Answer 1

Hormone levels generally decrease.

Explanation: if the egg isn't fertilized the corpus luteum degenerates in the late luteal phase, causing progesterone and estrogen to fall (LH/FSH remain low), and that hormonal drop triggers menstruation.