female reproduction Flashcards
low estrogen causes
negative feedback
* low but increasing estrogen - increased neg feedback
prolonged high estrogen causes
positive feedback
high estrogen + high progesterone causes
negative feedback
myometrium
smooth muscle around the uterus
endometrium
thickens, lose each month
when does mitosis occur in oogenesis
only before birth
when does meiosis occur in oogenesis
before birth, occurs again after puberty
when does the second meiotic division occur
only if fertilization occurs
release of progesterone decreases
GnRH
FSH
LH
what is needed to make estrogen
theca cells and granulosa
corpus leuteum
high levels of estrogen and progesterone also produces inhibin
surge in LH causes
ovulation
production of proteases
* breakdown wall of overy
* prostaglandin release
* first meiotic division
LH and FSH stimulate
estrogen production
theca cell lacks
enzyme to go from androgens to estrogen
FSH stimulates
follicles
in the luteal phase what is present
corpus luteum
what happens during the follicular phase
follicles developing
rise in estrogen
slight rise in progesterone at end
at ovulation what happens
LH surge
follicle disrupted
decreased estrogen
break positive feedback
what happens in the luteal phase
increase in progesterone
secondary follicles
increase estrogen
increase negative feedback
decrease FSH
when is the endometrium thickest
luteal phase
when is the endometrium thinnest
menstrual phase
when does the endometrium start thickening
after menstrual phase, before secretory phase (follicular phase)
menopause symptoms
decreased estrogen
* osteoporosis, hot flashes, mood swings
