Question at position 10 Which of these will occur during menstruation?The corpus luteum is very activeProgesterone levels will be high The old functional layer is sloughed offThe secretory glands and blood vessels will develop in the endometriumA new uterine lining will form

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Question: Which of these will occur during menstruation? The corpus luteum is very active, Progesterone levels will be high, The old functional layer is sloughed off, The secretory glands and blood vessels will develop in the endometrium, A new uterine lining will form.

Option 1: The corpus luteum is very active. During menstruation, the corpus luteum regresses if there is no fertilized ovum; it is not very active at this stage. In fact, luteal activity is lowest during menses and rises only if pregnancy occurs later. Therefore, this statement does not describe what happens during menstruation.

Option 2: Progesterone levels will be high. Progesterone is produced mainly after ovulation by the corpus luteum and helps maintain the endometrium in the luteal phase. During menstruation, if pregnancy has not occurred, progesterone levels fall as the corpus luteum regresses, leading to shedding of the endometrial lining. Thus, high progesterone is not characteristic of menstruation.

Option 3: The old functional layer is sloughed off. This is the key event of menstruation: the functional (superficial) endometrial layer is shed and expelled, while the basal layer remains to regenerate a new lining in the next cycle. This aligns with the standard description of menstrual physiology.

Option 4: The secretory glands and blood vessels will develop in the endometrium. The secretory phase, driven by progesterone after ovulation, promotes development of secretory glands and vascularization to support potential implantation. This occurs after ovulation, not during menstruation, so it does not describe the menstrual phase.

Option 5: A new uterine lining will form. A new functional endometrial lining begins to form after the shedding phase, but the actual formation of a renewed lining is more accurately described as the proliferative/early secretory phase that follows menstruation. The phrase as stated is more general and not specific to the menstruation itself, making it an inaccurate description of the menstrual event.

Overall, option 3 accurately captures the primary event of menstruation, while the other options reflect processes from other phases of the menstrual cycle or mischaracterize hormonal states during menses.

Question at position 10 Which of these will occur during menstruation?The corpus luteum is very activeProgesterone levels will be high The old functional layer is sloughed offThe secretory glands and blood vessels will develop in the endometriumA new uterine lining will form单项选择题

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