BI-995
Menstrual cycle
Biology · Secondary 3 · Hard · Menstrual cycle
In a 28‑day menstrual cycle, a woman does not become pregnant. What changes in progesterone level and the uterine lining cause menstruation to start at the end of the cycle?
- Progesterone falls and the uterine lining breaks down and is shed.
- Progesterone rises and the uterine lining breaks down and is shed.
- Progesterone falls and the uterine lining becomes even thicker.
- Progesterone rises and the uterine lining becomes even thicker.
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