The event happens in menstrual cycle when level of progesterone declines:
Correct answer: C. Beginning of menses
- A. Ovulation
- B. Corpus luteum formatio
- C. Beginning of menses
- D. Maturation of ovarian follicle
Explanation
Progesterone is essential to maintaining the lining of the endometrium. When its levels fall at the end of the menstrual cycle, the endometrium lining sheds leading to menstruation/beginning of menses. Menstruation, or the menstrual phase, typically occurs around Days 1-5 of the menstrual cycle. It represents the start of a new menstrual cycle if pregnancy has not occurred. The decline in progesterone is a key factor in initiating the physiological changes that result in the shedding of the uterine lining during menstruation.
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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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