ovulation - hormones and ovulation

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  • 8/13/2019 Ovulation - Hormones and Ovulation

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    By Dawn Stacey M.Ed, LMHC, About.com Guide

    How Do Hormones Cause Ovulation?Updated October 19, 2009

    About.com Health's Disease and Condition content is reviewed by the Medical Review Board

    Question: How Do Hormones Cause O vulation?

    Answer:

    To answer this question, lets take a quick look at what is

    normally going on inside the female body each month.

    The Starting Place:

    The Follicle Stimulating Hormone:

    The Role of t he Follicle:

    The LH Surge:

    The Corpus Luteum:

    The Shrinking of the Corpus Luteum:

    It all s tarts with the hypothalamus in the brain producing

    gonadotropinreleasing hormone(GnRH)

    The GnRH will then trigger the pituitary gland to releas e the follicle s timulatinghormone(FSH)

    The F SH then makes the journey to the female's ovaries (via the bloodstream)

    O nce it arrives, it initiates the growth of a follicle

    When the follicle develops , it generates estrogen

    A fter about 10 days, the estrogen levels reach high numbers

    The es trogen levels peak approximately 1 day before ovulation(typically, this is day

    13 in a standard 28 day cycle)

    This peak elicits a s urge of luteinizing hormone(LH) from the pituitary gland.

    This surge acts a c ue to the ovarian follicle

    A bout 36 hours later, a mature egg is releas ed into the fallopian tube

    The egg leaves behind the corpus luteum(the empty follicle)

    The c ells of the corpus luteum then produce progesterone and estrogen

    Together, these two hormones stimulate the uterine lining to thicken with blood

    This is done to prepare the uterus walls for nurturing a fertilized egg

    The c orpus luteum will begin to diminish

    This leaves the uterine lining with no hormonal supportThe lining will begin to shed off

    The female's monthly period begins

    The low levels of estrogen and progesterone als o s ignal the hypothalamus to s tart the

    process over again.

    Back to Main Page: Hormonal B irth Control Questions

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    Ovulation

    Photo 2009 Dawn Stacey

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