Mod 5 pt2 Flashcards
hCG
human chorionic gonadotropin
developing embryo, placenta
maintains corpus luteum
levels decline when cl deteriorates
Estrogen (preg)
corpus luteum, placenta
decrease in GnRH, FSH, LH to prevent ovulation and menstruation
rises to help maintain pregnancy
stimulates enlargement of uterus
increased levels near birth induces uterus wall response to oxytocin for birth
progesterone
corpus luteum, placenta
maintains the endometrium
decrease in GnRH, FSH, LH to prevent ovulation and menstruation
stimulates change in mother’s body (mucus plug in cervix, placental and breast growth)
rise near birth to inhibit contractions
relaxin (preg)
corpus luteum, placenta
relaxes maternal muscle joints, ligaments, uterine muscles
allow for expanding foetus
prepares lining for implantation
prolactin
pituitary gland
stimulates production of milk in mammary glands of breasts
rises in 2nd trimester
estrogen (birth)
placenta
coutneracts progest on supressing contractions
increases sensitivity of uterus for action of oxytocin
high levels induce labor
oxytocin
pituitary gland
triggers and maintains labor causing contractions of uterus to increase pressure of babys head on cervix
causes placenta to release prostaglandins
releases milk from breat when baby suckles
prostaglandin
uterus wall
helps to initate labour and stimulate uterus contractions by reducing progresterone
relaxin (birth)
ovaries
dilate or open the cervix
widens pubic bone
relaxes pelvic ligaments to allow passage of baby
GnRH
hypothalamus
triggers pituitary gland to release LH and FSH
follice stimulating hormone FSH
pituitary gland
stimulates follices to grow in ovaries
luteinising hormone LH
pituitary gland
high levels cause egg to burst from mature follice (ovulation). remanents of follice form the corpus luteum
