What is the typical duration of menstruation?
1–3 days
3–7 days
7–10 days
10–14 days
The Correct Answer is B
Menstruation marks the beginning of the menstrual cycle and involves the shedding of the functional layer of the endometrium due to the decline of progesterone and estrogen. It is triggered by corpus luteum regression in the absence of fertilization. Normal menstrual bleeding lasts 3–7 days, with average blood loss between 30–80 mL. Levels of FSH (3–20 IU/L) begin to rise to recruit new follicles for the next cycle. Prostaglandins are released, causing vasoconstriction and myometrial contractions, leading to menstrual cramps and tissue expulsion.
Rationale for correct answer
B. The normal duration of menstruation is 3–7 days. This range is physiologically typical and supported by stable hormone withdrawal patterns and normal endometrial responses.
Rationale for incorrect answers
A. A duration of 1–3 days is shorter than the normal range and may indicate hypomenorrhea or hormonal insufficiency, though still considered normal if consistent and asymptomatic.
C. Bleeding for 7–10 days exceeds the upper normal limit and may suggest menorrhagia or coagulation abnormalities, requiring evaluation.
D. A menstrual duration of 10–14 days is abnormal and often pathological. It may suggest hormonal imbalance, fibroids, endometrial hyperplasia, or bleeding disorders.
Take home points
- Normal menstruation lasts 3–7 days with 30–80 mL blood loss.
- Bleeding <3 days or >7 days may indicate hormonal or structural pathology.
- Menstruation occurs due to hormonal withdrawal after corpus luteum regression.
- Prostaglandins play a role in endometrial shedding and cramping.
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Related Questions
Correct Answer is ["A","B","C","D"]
Explanation
Menstrual phase of the uterine cycle The menstrual phase marks the beginning of the uterine cycle and is initiated by a sudden drop in estrogen and progesterone levels due to corpus luteum regression in the absence of implantation. This hormonal decline leads to vasoconstriction of spiral arteries, ischemia, and shedding of the functional layer of the endometrium. Normal menstrual flow lasts 3–5 days, and blood loss averages 30–40 mL. Spiral artery spasms result in tissue necrosis, and rising estrogen levels only commence after menstruation is complete.
Rationale for correct answers
A. The withdrawal of estrogen and progesterone at the end of the luteal phase triggers endometrial breakdown and onset of menstrual bleeding.
B. The functional layer of the endometrium undergoes necrosis and is shed through the cervix and vagina as menstrual fluid.
C. Spiral arteries undergo intense vasoconstriction, leading to ischemia and necrosis of the endometrium, which causes menstruation.
D. The menstrual phase typically spans Days 1 to 5 of the cycle, marking the beginning of the uterine cycle before follicular estrogen rise.
Rationale for incorrect answers
E. Rising estrogen levels occur during the proliferative phase, which begins after menstruation. The menstrual phase is marked by low estrogen and progesterone levels.
Take home points
- Menstrual phase starts with progesterone and estrogen withdrawal.
- Endometrial shedding is due to spiral artery ischemia.
- Menstrual flow usually lasts 3–5 days.
- Rising estrogen levels define the proliferative phase, not the menstrual phase.
Correct Answer is C
Explanation
Estrogen, specifically estradiol (E2), plays a dual role in the hypothalamic-pituitary-ovarian axis through both negative and positive feedback mechanisms. During the late follicular phase, when estradiol levels remain consistently high—typically >200 pg/mL for at least 50 hours—the feedback on the hypothalamus and anterior pituitary shifts from negative to positive. This stimulates a GnRH surge, which triggers a massive LH release (LH surge), leading to ovulation. The LH surge also initiates the transformation of the ruptured follicle into the corpus luteum.
Rationale for correct answer
C. Estrogen at sustained high levels switches to positive feedback, stimulating GnRH and causing the LH surge. This is the critical hormonal trigger for ovulation around day 14 of a typical 28-day cycle.
Rationale for incorrect answers
A. Progesterone exerts only negative feedback on GnRH, FSH, and LH throughout the cycle, especially during the luteal phase. It does not cause the LH surge and actually prevents further ovulation.
B. FSH is regulated by negative feedback via estrogen and inhibin. It does not trigger the LH surge and is not part of the positive feedback loop leading to ovulation.
D. Inhibin is secreted by granulosa cells and specifically suppresses FSH release via negative feedback. It plays no role in triggering the LH surge or stimulating GnRH.
Take home points
- High sustained estrogen levels trigger positive feedback on GnRH and LH.
- The LH surge causes ovulation and luteinization of the follicle.
- Progesterone and inhibin exert negative feedback and suppress further ovulation.
- FSH supports follicle growth but is not involved in the LH surge trigger.
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