Question at position 32 The corpus luteum is responsible forstimulating ovulationsecreting progesterone and estrogeninitiating pubertystarting menstruationClear my selection

Question

BlackTom AI · Accepted Answer

The corpus luteum secretes progesterone and estrogen, so the correct choice is "secreting progesterone and estrogen."

1. Relevant knowledge points and concepts
- Ovarian cycle phases: follicular phase → ovulation → luteal phase.
- Corpus luteum formation: after a mature ovarian follicle releases an oocyte at ovulation, the remaining follicular cells luteinize to form the corpus luteum.
- Hormone production: the corpus luteum primarily secretes progesterone and also produces estrogen.
- Functional outcomes: progesterone prepares and maintains the endometrium for possible implantation and provides negative feedback on LH/FSH; if pregnancy does not occur the corpus luteum degenerates, progesterone falls, and menstruation starts.

2. Step-by-step reasoning
- Follicle development (days ~1–13) leads to a dominant follicle producing rising estrogen.
- Midcycle estrogen peak triggers LH surge → ovulation around day 14.
- Immediately after ovulation, luteinization converts the ruptured follicle into the corpus luteum.
- The corpus luteum secretes progesterone (high during luteal phase, ~days 14–28) and continued estrogen at moderate levels.
- These hormones thicken and stabilize the endometrial lining and inhibit further LH/FSH pulses. If no implantation, the corpus luteum degenerates, hormone levels fall, and menstruation begins.

3. Intermediate timing/levels (no numeric calculation required)
- Estrogen peaks pre-ovulation; LH surge at peak; progesterone peaks in luteal phase (about one week after ovulation).
- hCG from an implanted embryo can rescue the corpus luteum, maintaining progesterone secretion until the placenta takes over.

4. Why the correct answer is correct
The primary physiological role of the corpus luteum is endocrine: it secretes progesterone (dominant) and estrogen to support the luteal phase and early pregnancy. This is the canonical textbook function.

5. Why other options are incorrect
- Stimulating ovulation: ovulation is triggered by the LH surge caused by pre-ovulatory estrogen, not by the corpus luteum (which forms after ovulation).
- Initiating puberty: puberty is driven by activation of the hypothalamic–pituitary–gonadal axis, not by the corpus luteum.
- Starting menstruation: menstruation is the result of corpus luteum degeneration and falling progesterone, so the corpus luteum does not start menstruation.

6. Conclusion
The correct answer, "secreting progesterone and estrogen," matches the provided answer.

Question at position 32 The corpus luteum is responsible forstimulating ovulationsecreting progesterone and estrogeninitiating pubertystarting menstruationClear my selection单项选择题

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