In the last few weeks of pregnancy, the level of estrogen in the woman's blood rises. This increase causes

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The increase in estrogen during the late stages of pregnancy causes the muscles of the uterus to become more sensitive to oxytocin, a hormone that stimulates contractions. This is an important part of the process of labor and delivery. A and B are incorrect because estrogen does not directly affect fetal development or the secretion of prostaglandins by the placenta. D is incorrect because estrogen is primarily produced by the ovaries, not the pituitary gland.

In the Last Few Weeks of Pregnancy, the Level of Estrogen