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Estrous Cycle

The order of the Estrous Cycle

Part 1Part 2
Brain initiates the cycle The release of GnRH causes the release of FSH
FSH is carried to ovaries where it causes the growth of selected ovarian follicles Follicles produce estrogen and inhibin
Inhibin causes only species specific number of follicles to mature by inhibiting further release of FSH Estrogen stimulates GnRH to stimulate the release of LH causing the mature follicle to ovulate
The follicle transforms CL in the oviduct The CL produces progesterone to maintain pregnancy
Fertilization occurs and pregnancy begins Early embryo signals uterus and ovary that pregnancy is established
If egg is not fertilized, the CL continues to develop and maintains progesterone production (This is called diestrus) The uterus releases prostaglandin if it doesn't receive the embryo signal.
Prostagliandin lyses the CL causing a decrease in progesterone and ending diestrus Follicle growth (would continue without progesterone) after the death of CL is called proestrus and the cycle repeats.
Created by: acparris
 

 



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