7.9 Flashcards
what happens to levels of estrogen and progesteron during pregnancy?
their levels increase in order to mainten:
- the endometrium
- breast developement
- suppression of new ovarian follicle
what is the hormonal source in the first trimester?
corpus luteum
what is the hormonal source in the second-third trimesters?
Placenta
what does the implantation of the blactocytes depends on?
low estrogen/progesterone ratio
means higher progesteron levels!
whan do the secretion of hCG occurs?
8 days after ovulation
can be detected in urine after the 9th day
hCG is similar in activity to
LH
hCG job?
informs the corpus luteum that fertilization occurred
what secrete the hCG in the 1st trimester?
Trophoblasts
hCG levels peak at week
9
after progesteron is being made by the placenta in the second and third trimester it goes back to the maternal blood where it is converted to-
pregnanediol= marker for proper placenta functions
progesteron is used by fetus adrenal cortes to produce
cortisol and aldosteron
what do the fetus adrenal cortex lack?
the enzyme 3B-HSD
