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In my AP Bio class we were learning about the female reproductive cycle. We learned that an increase in estrogen causes the anterior pituitary to release a surge of luteinizing hormone, which releases the egg (ovulation). I also read on-line that "the pill" contains hormones, estrogen and progesterone, and these stop ovulation, but keep the rest of the cycle going. If estrogen is what causes ovulation, how can the estrogen in the pill stop ovulation? Thanks, and sorry if my question doesn't make sense. Ashley
Answer 1:

I think the key thing to note is that a spike in the estrogen level leads to ovulation. With the pill, the level of estrogen is high, but constant. Without the spike ovulation does not occur.


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