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How would administering progesterone and estrogen prevent pregnancy?

How would administering progesterone and estrogen prevent pregnancy?

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Progesterone is the hormone which helps the uterus for receiving the fertilized ovum. Estrogen is the hormone which aids in the development of female reproductive organs and the secondary feminine characteristics in a grown female.Progesterone and estrogen plays important role in menstrual cycle.

When both progesterone and estrogen are administered they block ovarian stimulation by preventing the release of follicle stimulating hormone from anterior pituitary . As FSH is not released the grafian follicle doesn't ripe and ovulation is stopped .These also alter the character of cervical mucus.

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