What event occurs in the menstrual cycle when the level of progesterone declines?
Correct answer: B. Menstruation
- A. Ovulation
- B. Menstruation
- C. Menopause
- D. Fertilization
Explanation
When the level of progesterone declines, it signals the beginning of the menstrual phase of the menstrual cycle. During the menstrual phase, the lining of the uterus (endometrium) breaks down and is shed.
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About Menstrual Cycle
The menstrual cycle covers the coordinated changes in the ovaries and uterus, including menstruation, follicular growth, ovulation and corpus luteum formation. It links follicle-stimulating hormone, luteinizing hormone, oestrogen and progesterone with endometrial changes, and distinguishes the ovarian cycle from the uterine cycle and the hormonal events of pregnancy.
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