Join TSR now and get all your revision questions answeredSign up now

How do hormones in oral pills prevent conception whereas the endogenous ones don't? Watch

    • Thread Starter

    How do exogenous hormones in oral contraceptive pills prevent conception whereas the endogenous ones do not?

    Combined oral pills contain Progesterone and Oestrogen. These two hormones are naturally present in a woman's body. So how come these hormones, when obtained from pills, prevent a woman from becoming pregnant, whereas the same hormones that are naturally present in her body don't do so.
    • TSR Support Team
    • Very Important Poster
    • PS Reviewer
    • Clearing and Applications Advisor

    These hormones are expressed by the body at certain levels which vary over the course of the menstrual cycle so the woman is more susceptible to pregnancy at certain times and less at others. The pill maintains these hormones at a constant high level throughout the cycle ensuring that the woman is protected against pregnancy throughout the cycle.
    • Study Helper

    Pretty much as the above said, these hormones are regulated and are expressed at different times during the menstrual cycle. The woman may be at a point where she is susceptible to pregnancy and the hormones preventing this are down regulated, giving a pill containing these hormones ensures that pregnancy won't take place during the time period at which the person is susceptible.
Which web browser do you use?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.