Science

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1. 
   cybil Teacher
   High School - 12th Grade

   The endometrium, which is the lining of the uterus, becomes thickened in anticipation of a fertilized egg every month. If one does not implant itself in the endometrium, then the lining is sloughed off by the process of menstruation. The uterus contracts to expel the endometrium; therefore, after menstruation, the lining is thin as the uterus prepares for the new cycle. 

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   http://www.enotes.com/britannica-encyclopedia/menstruation

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   Posted by cybil on Monday June 23, 2008 at 12:03 PM
   
   

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