15 Mar How Birth Control Pill Works
The physical, and sometimes emotional, changes a woman goes through on a monthly basis are caused by hormones that work together, communicating between the brain and the reproductive system. The birth control pill jumps into this relay system midstream, delivering two key sex hormones that trick the brain into thinking the body is already pregnant.
View the phases of activity in each monthly cycle and monitor the changing hormonal levels. Click on the link below and select ‘Female Menstrual Cycle’ or ‘Menstrual Cycle with Pill’ to begin.
https://www-tc.pbs.org/wgbh/amex/pill/sfeature/sf_cycle.swf