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Birth control pill - series

Release of estrogen:

During a normal menstrual cycle, hormones stimulate the ovary causing an egg to ripen. The uterine lining thickens preparing itself for implantation of a fertilized egg and the cervical mucus thins to help sperm reach the egg.

Reviewed last on: 5/6/2007
Rachel A. Lewis, MD, FAAP, Columbia University Pediatric Faculty Practice, New York, NY. Review provided by VeriMed Healthcare Network.

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