combination birth control pills contain estrogen and progestin. A typical pill packet contains 3 weeks of active hormones and 1 week of placebo pills.  During the week of placebo pills, menstruation occurs. Use your knowledge of the hormonol control of the female reproductive system to: 1) Explain how the pills alter the feedback pathways of FSH and LH to prevent pregnancy. 2) Explain why menstruation occurs during the placebo week

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