7.1 Physiological changes in the female reproductive system during pregnancy 7.1.1 Changes in oestrogen and progesterone
In Study Sessions 3, 4 and 5 you learned about the main female reproductive hormones, oestrogen and progesterone, and their functions in preparing the uterus for pregnancy. Oestrogen and progesterone are also the chief hormones throughout pregnancy.
A woman will produce more oestrogen during one pregnancy than throughout her entire life when not pregnant. During pregnancy, oestrogen promotes maternal blood flow within the uterus and the placenta.
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