Flashcards in L83: Pregnancy and Partuition Deck (12)
Relaxin is produced by
corpus luteum and placenta
Marker of fetal wellbeing
Although estriol is the major estrogen of pregnancy,
it has weak estrogenic activity.
The placenta has limited capacity to synthesize cholesterol and relies almost exclusively on ______ as its cholesterol source.
Cervical stretch induces OXY release from post. pituitary. OXY promotes prostaglandin release. OXY also promotes hemostasis of placental vessels. Prostaglandins promote cervical contractions.
Let down reflex
OXY induced secretion of milk from nipples, in response to suckling or even auditory sounds (eg. baby crying). OXY induces contraction of myoepithelial cells and alveoli and smooth muscle of duct walls causing “milk letdown” for infant.
The most dominant signal for partition is
Decreased progesterone, increased estrogen
alpha adrenergic receptor
stimulates myometrial contraction
inhibits myometrial contraction
Aside from high estrogen:progesterone ratio, what other factors can precipitate labor?
Cortisol and catecholamines
Does OXY initiate labor?
No. It plays a role after initiation.