The secretory phase of the uterine cycle is associated with:

Question

BlackTom AI · Accepted Answer

The secretory (luteal) phase is characterized by progesterone secretion from the corpus luteum, so answer b is correct.

1. Relevant knowledge points and concepts
- The uterine cycle has three phases: menstrual (days 1–5), proliferative/follicular (approx. days 6–14), and secretory/luteal (approx. days 15–28).
- Ovarian cycle events: follicle maturation → LH surge → ovulation → formation of corpus luteum.
- The corpus luteum secretes progesterone (and some estrogen). Progesterone induces endometrial glandular secretion, stromal edema, and vascular changes to prepare for implantation.

2. Step-by-step reasoning process
- Midcycle an LH surge causes ovulation (end of proliferative phase).
- After ovulation the ruptured follicle becomes the corpus luteum.
- The corpus luteum produces high levels of progesterone (and moderate estrogen).
- Elevated progesterone acts on the previously estrogen-primed endometrium, converting it to a secretory lining that nourishes a potential embryo.

3. Intermediate “calculation” or timeline steps (no numeric math required)
- Day ~14: ovulation (LH surge).
- Days ~15–28: corpus luteum active → progesterone rises → secretory changes in endometrium.
- If no implantation: corpus luteum regresses, progesterone falls → menstrual bleeding begins.

4. Why the correct answer is correct
- “Increased secretion of progesterone and formation of the corpus luteum” directly names the ovarian source (corpus luteum) and the dominant hormone (progesterone) responsible for the secretory uterine changes; this is the defining physiology of the luteal/secretory phase.

5. Why the other options are incorrect (briefly)
- a: LH surge and ovulation occur at midcycle, not during the secretory phase.
- c: Loss of blood/endometrial tissue describes menstruation (menstrual phase), not the secretory phase.
- d: FSH-driven follicle maturation occurs in the follicular phase; FSH is not the hallmark of the secretory phase.
- e: Estrogen and follicle maturation describe the proliferative/follicular phase, not the secretory phase.

6. Conclusion
The physiological events—corpus luteum formation and elevated progesterone—define the secretory phase, confirming choice b.

The secretory phase of the uterine cycle is associated with:单项选择题

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