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    A question in my AQA biology exam was:

    Oestrogen is present in some contraceptive pills. Explain how oestrogen acts a contraceptive.

    The answer is :

    Inhibits release of FSH so follicle does not develop so ovulation is prevented.

    I dont understand how giving someone oestrogen would cause this, since surely you are increasing the concentration of oestrogen and therefore a high concentration would inhibit FSH
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    I don't understand.
    You answer your own question?

    (Original post by Need90+forpaper2)
    The answer is : Inhibits release of FSH so follicle does not develop so ovulation is prevented. surely you are increasing the concentration of oestrogen and therefore a high concentration would inhibit FSH
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    Low levels of oestrogen (found in the contracteptive pill) inhibit FSH production, so follicle doesn't develop. No follicle means no further secretion of oestrogen. This means oestrogen levels do not increase, so LH secretion isn't promoted. No LH so no promotion of ovaries to release oestrogen

    (Original post by Need90+forpaper2)
    A question in my AQA biology exam was:

    Oestrogen is present in some contraceptive pills. Explain how oestrogen acts a contraceptive.

    The answer is :

    Inhibits release of FSH so follicle does not develop so ovulation is prevented.

    I dont understand how giving someone oestrogen would cause this, since surely you are increasing the concentration of oestrogen and therefore a high concentration would inhibit FSH
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    (Original post by CMooreFalcons)
    Low levels of oestrogen (found in the contracteptive pill) inhibit FSH production, so follicle doesn't develop. No follicle means no further secretion of oestrogen. This means oestrogen levels do not increase, so LH secretion isn't promoted. No LH so no promotion of ovaries to release oestrogen
    Fantastic, Thank you very much
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    Moved to the biology forum
 
 
 
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