In pregnant rats, the BPF was also found in the uterus, placenta, amniotic fluid and fetuses, indicating that BPF is able to be absorbed into the reproductive tract and pass through the placental barrier in pregnant rats.
22.
:The main endogenous opioid associated with orgasm is ?-endorphin, which can cross the placental barrier, so it seems plausible that the fetus would experience the opiate-high elements of orgasm, but that's a long way from the full and complex emotional and physical experience.
23.
On rare occasion, pregnant women who have been infected and turned survive long enough to give birth, but their babies are born infected as well-apparently the placental barrier provides no protection against the infection ( though it is possible that it does, but unsanitary birth conditions infect them during delivery itself, like neonatal conjunctivitis ).
24.
As Ellis & Cole-Harding ( 2001 ) outline, the chain of events in prenatal stress affecting brain sex differentiation appears to be that stress causes the mother's adrenal glands to release high levels of stress hormones into the blood system, substantial proportions of which cross the placental barrier and interfere with the fetus'production of sex hormones temporarily, most notably testosterone.
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