That is going to cause the follicular phase of the cycle,
which is when the follicle starts to mature or continues to mature.
Remember the first part is not dependent on GnRH or LH or
SFH, it's the second part of maturation.
So that's what's going to start because we have a little bit of
an increase in LH and FSH.
We're gonna have our follicles maturing, making more and more estrogen.
We're gonna have our chosen follicle making a lot of estrogen
enough to now have a small decrease in LH and
FSH production that's going to kill the other follicles.
And then, finally, we're gonna have the maturing follicle large enough that it
produces this large rapid increase in estrogen that acts on that
second group of kisspeptin neuron to cause the LH surge.
So that's what's shown in green right here.
This LH surge, which triggers ovulation,
the release of the egg, and causes corpus luteum formation,
where the granulosa cells and theca cells that remain
are gonna continue to make estrogen, as shown right here,
but then also increase dramatically the amount of progesterone made.
That will continue for a certain amount of time,
[COUGH] until eventually, the corpus luteum is gonna degenerate,
and when it does that, it's going to stop producing its hormones,
estrogen and progesterone will fall dramatically.