Which Event Occurs Before All the Others, Leading to the Delivery

question 212

Multiple Choice

Which event occurs before all the others, leading to the delivery of a human baby?

• A) An increase in the ratio of estrogen to progesterone
• B) Pressure of the fetal head on the cervix communicated to the hypothalamus
• C) An increase in secretion of oxytocin by fetal and maternal posterior pituitaries
• D) Dilation of the cervix
• E) A positive feedback loop involving oxytocin and uterine contractions

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