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.
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