4.2 Menstrual Cycle Flashcards
why can’t GnRH analogues be used as contraception?
they basically cause menopause which affects oestrogen levels
hormones produced by Graafian follicle
oestrogen and inhibin
affect of inhibin on LH during late follicular phase
helps LH to increase theca cell androgen production, to be converted to oestrogen
when does an oocyte complete meiosis 2 and fully mature?
fertilisation
corpus lute lifespan
14 days +/- 2
3 phases of uterine cycle
menstrual, proliferative, secretory
why are there lots of coiled arterioles in endometrium during secretory phase of uterine cycle?
rich blood supply to support embryo
what does corpus lute become if no fertilisation?
corpus albicans
compare the cervical mucus during the follicular and luteal phases
folliclular- thin alkaline: helps sperm to fertilise egg
luteal- thick, acidic: stops more sperm
what are some metabolic changes that occur in luteal phase?
bloating, breast tenderness, oily skin, mood changes
overall function of follicular phase
get sperm and egg where they need to be
which hormone should be tested to see if ovulation has occurred? when does it peak? when does temp increase?
progesterone
peaks at day 21
after ovulation
in what stage of meiosis do the following arrest in?
-primary oocyte at birth
-secondary oocyte each month
-prophase 1
-metaphase 2
2 hormones of follicular phase
oestrogen and inhibin
how is LH linked to secondary oocyte?
surge in LH thins Graafian follicle membrane, so within 24-48 hours the secondary oocyte ruptures the membrane, is released
