Debate and discussion of any biological questions not pertaining to a particular topic.
8 posts • Page 1 of 1
One hypothesis is that when the ovaries shut down in menopause, LH rises to try to get a cycle started (it'll give up eventually), and that produces a lot of the symptoms of menopause. When the LH levels drop, the symptoms are supposed to go away.
LH synthesis also drops at menopause, in each menstrual cycle. It's really a lot to explain here. a very elaborate dance of hormones that regulate themselves both positively and negatively. Try searching on google. We would be more than happy to answer any questions regarding it, since it is kinda hard to grasp.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
When a woman is pregnant, the corpus luteum will keep on producing progesterone that will stop the production of LH.
As Such, LH will of course stop production.
Is this what your book is trying to explain?
Note: Please correct me if I'm wrong, thank you!
To be a giant in your profession, you must always be committed to growing.
Ignore what i said. i actually made two mistakes.
One: I was thinking menstruation, not menopause
Two: Though it is LH in my post, it was progesteron in my head, which decreases at menstruation
I appologise again.
Yes, LH synthesis does decrease at pregnancy. It's role is taken over my HCG
Just to summarise (most points have been already made)
Day 1-14 = LH production increases slowly (effect of FSH production cauising development of thecal cells of oocyte)
Day 14 ('ovulation') = LH surge (positive feedback due to oestrogen)
Day 14-28 = High progesterone -> Inhibition of LH
[NB. Day 28 is menstration]
Pregnancy: High progesterone production -> Inhibition of LH
At birth: Decreased progesterone -> LH produced the same as start of menstral cycle
Menopause: Decreased oestrogen production -> LH levels rises*
(*Darby - this is due to loss of negative feedback)
Last edited by Revenged on Tue Jul 03, 2007 11:09 pm, edited 1 time in total.
This occurs due to production of hCG (human chorionic gonadotrophin) by the menstral lying as a result of implantation of the embryo... but the corpus luteum will still degenerate after ~6 weeks... After 6 week the placenta takes over production of progesterone...
8 posts • Page 1 of 1
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