what closes epiphyseal plates?
estrogen converted from testosterone
what causes differentiation of internal genitalia in men?
testosterone (except prostate, DHT)
where is androstenedione made?
source of estrogen in women?
ovary (17B estradiol)
blood (via aromatization)
potency of estrogens?
estradiol > estrone > estriol
hormonal indicator of fetal well being?
estriol (1000-fold increase)
fertilization usually occurs where?
ampulla (upper end of fallopian)
when does implantation occur?
6 days after fertilization
when is hCG detectable for pregnancy?
in blood 1wk after conception, in urine 2wks after conception
what induces lactation?
drop in progesterone
what induces milk letdown?
what induces and maintains lactation?
role of hCG in pregnancy?
acts like LH to maintain corpus luteum secretion of progesterone to maintain uterus
test for menopause?
large increases in FSH d/t loss of negative feedback from estrogen, which declines significantly in menopause
average age of onset for menopause?
51, but earlier in smokers