Phys review, michels Flashcards
(55 cards)
when the corpus luteum sheds what happens to E and P levels? pituitary?
E and P drop
pituitary then increases FSH
increasing FSH stimulates what response in menstrual cycle
recruits large antral follicles to grow and they begin to secrete low amounts of E and inhibin
How do E and inhibin affect FSH
negative feedback
what occurs with declining FSH levels
atresia of all but 1 follicle that will now secrete high levels E
how does high E affect gonadotrophs
LH and some FSH surgres
LH surge causes what
metabolic maturation, ovulation, leutinization
corpus luteum now makes high P and some E and inhibin
response to high P and E and inhibin levels
negative feedback to LH and FSH returning to basal levels
if LH levels remain at basal level what will happen to corpus luteum
will die
3 stages of follicular development
initiation and gonadotropin independent phase
basal growth phase
rapid growth phase
what follicles are not dependent on pituitary gland
primordial, and primary
how many days is the rapid growth phase from large antral to dominant follicle
14 days
hormone producing cells
theca cells
what cells form corpus luteum
mural granulosa cells and theca cells
before ovulation what phase does the primary oocyte undergo
from prophase I to arrest in metaphase II
when does the secondary oocyte complete meiosis
at fertilization
at follicular phase what does GnRH do
pulsatile to stimulate LH act on theca cells and FSH act on granulosa cells
at end of follicular phase why is there LH surge
high levels E gives + feedback
what happens to theca cells and granulosa cells in luteal phase
theca still respond to LH
granulosa now respond to FSH AND LH
both types cells become luteal cells that secrete P and E
feedback from E and P in luteal phase
negative feedback
what are corpus albican
scar tissue in ovary form recent regression of corpus luteum
what are the parts of fallopian tube
infundibulum is opening
ampulla- fertilization takes place
isthmus
intramural segment (proximal)
estrogen effects on oviduct
increase endosalpinx epithelial size increase blood flow increase glycoproteins increase ciliogenesis increase mucus and muscular tone
progesterone effects on oviducts
dec epithelial size
dec mucus
relax muscular tone
deciliation
phases of menstrual cycle
menstrual phase
proliferative phase
secretory phase
