Progestrone

[joonkimdds]

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B. shuts off FSH production
C. prepares uterus for implanataion of the zygote

answer was C but isn't B also correct?
I thought progestron shuts off FSH and LH thus preventing ovulation.

 

[JohnDoeDDS]

I believe Estrogen is antagonistic with LH. But it actually causes LH to peak during ovulation.

 

[smnop]

now i'm confused!!🙁

 

[GRAD]

When I took bio, i also learned that progesterone was the negative feedback, but in my Kaplan classes, and from what it says there- esp if you're getting a question from them, they say that this is what happens:

fsh is increased to make follicle- fsh secretes estrogen
Estrogen increases, and eventually shuts off Fsh and LH gets turned on (also by estrogen) , and by turning on LH, you get the follicle to turn into the corpus luteum, which secretes progesterone to mature the endometrium for implantation.

 

[Manyak222]

Hi levels of both estrogen and progesterone together inhibit GnRH, which in turn inhibits FSH. GnRH has a pos feedback on LH only.

 

[joonkimdds]

Hi levels of both estrogen and progesterone together inhibit GnRH, which in turn inhibits FSH. GnRH has a pos feedback on LH only.

Yeah, that's exactly what I learned.
LH and FSH are regulated by GnRH.
Progesterone basically inhibit GnRH to inhibit LH and FSH.
This is why I think B should be the answer too.

 

[Manyak222]

it is the COMBINATION that shuts off LH and FSH by inhibitin of the hypothalamus and pituitary system. C is a better answer bc progesterone is soley responsible for preparation for implantation, although technically you are right. Poorly stated question dude.

Yeah, that's exactly what I learned.
LH and FSH are regulated by GnRH.
Progesterone basically inhibit GnRH to inhibit LH and FSH.
This is why I think B should be the answer too.