Biology Homeostasis GCSEWatch
I'm studying homeostasis right now and I am a little confused.
For combined contraceptive pills, they contain a synthetic oestrogen and progesterone.
Since progesterone inhibits FSH & LH, why is oestrogen needed? I mean isn't that ironic? Oestrogen stimulates LH so...why is it needed as well?
Maybe it’s to do with their roles in maintanence of the uterus lining since only giving progesterone would mean it maintaining a lining which never grew ?? Also fairly certain oestrogen is needed for other things besides menstruation so maybe it’s to do with keeping oestrogen levels up as well as egg release inhibition?? Not too sure, best guess with rev guide in hand , sorry if it’s confusing /wrong
The oral contraceptive, which is known as the pill, contains oestrogen or progesterone or a combination of both hormones. These hormones inhibit the production of FSH, and eggs cannot mature.
Oestrogen at low levels stimulates the release of eggs. However at high doses, oestrogen will inhibit FSH production. After taking the pill for a while, egg development and release will stop completely. If there is no egg available, there can be no baby. This is why contraceptive pills are so effective.