Biological Sciences 26 Flashcards
two cell types involved in estrogen production
theca cells
granulosa cells
what do theca cells and granulosa cells have in common?
both have LDL and LH receptors
both can convert cholesterol to progesterone
Only theca:
progesterone to androgens
must send androgens to granulosa
only granulosa:
send progesterone to theca to convert to androgen
converts androgens to estrogens
FSH receptor
role of FSH in estrogen production
binds to GRANULOSA cells to convert androgen to estrogen
hypothalamic releasing hormone:
GnRH
anterior pituitary sex hormones
FSH, LH
ovarian hormones
estrogen, progesterone
Levels on FSH, LH during childhood
almost absent
days of ovarian cycle:
5-14
follicular growth
days of ovarian cycle:
14
ovulation
days of ovarian cycle:
14-23
development of corpus leuteum
days of ovarian cycle:
24-28
regression of corpus leutuem
days of uterine cycle:
1-5
menstruation
days of uterine cycle:
4-14
proliferation
days of uterine cycle:
14-28
secretion
estradiol trends during menstrual cycle
low level
spikes but increase prior to ovulation
decrease sharply after ovulation
remain low until day 20 ad slight increase
progesterone trends during menstrual cycle
starts low
bell curve peak 1 day after ovulation
levels decline
FSH trends during menstrual cycle
start highest [ ]
sharp increase (2 fold) prior to ovulation
decrease during ovulation
LH trends during menstrual cycle
sharpest increase one day before ovulation
ovarian hormones
estrogen
progesterone
what provides nourishment for ovum (primordial follicles)
granulosa cells
granulosa cell function
provide nourishment for ovum
surround primordial follicle
secrete oocyte maturation inhibiting factor (stays in primordial state)
