menstruation n tingz Flashcards
which is the most important hormone in follicular development?
anti-Mullerian hormone (AMH)
where is AMH secreted from?
small ovarian follicles
what does AMH cause?
reduction in oestrogen
starting with the release of AMH, describe the first half of ovulation.
1) AMH released
2) oestrogen drops
3) this drop triggers GnRH release
4) GnRH triggers FSH + LH release
where is GnRH released from?
hypothalamus
where do FSH and LH get released?
anterior pituitary
starting from the follicle getting bigger, describe the second half of ovulation.
1) follicle grows
2) AMH goes down
3) oestrogen goes back UP
4) GnRH goes down
5) FSH + LH go down
6) dominant follicle is large enough to survive and support itself
7) releases its own oestrogen
6) causes LH + FSH surge
7) egg released (ovulation)
what happens to the released egg at the end of ovulation?
it will be swept away by fimbrae
what happens to the follicle after the egg has been released?
- becomes corpus luteum
- releases oestrogen + progesterone
which hormones does the corpus luteum release and why?
oestrogen and progesterone, to maintain endometrium for potential embryo
what happens in the event the egg is not fertilised?
- corpus luteum dies
- oestrogen + progesterone levels fall
- lining sheds (menstruation)
how long is the luteal phase?
14 days, FIXED
what happens if the embryo does implant in the endometrium?
- trophoblast tissue starts producing hCG
- CL carries on releasing oestrogen + progesterone
when does the placenta replace the corpus luteum in hormone release?
8-10 weeks gestation
key feature in hypothalamic hypogonadism?
amenorrhoea
