Prepare for NEET Biology Human Reproduction (Menstrual Cycle) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to analyze hormonal changes, follicular and luteal phases.
NEET Questions / Zoology / Human Reproduction / Menstrual Cycle
A woman with a regular 28-day menstrual cycle experiences a surge in LH on day 14. If fertilization occurs, which of the following hormonal changes is MOST likely to be observed around day 21?
Elevated progesterone and hCG levels, with declining LH levels
Declining progesterone, LH, and hCG levels
Elevated LH and FSH levels, with declining progesterone levels
Elevated estrogen and LH levels, with stable progesterone levels
In a woman with a history of anovulatory cycles, which of the following hormonal profiles is MOST likely to be observed during the luteal phase?
Low progesterone and consistently low LH
High progesterone and pulsatile LH secretion
High progesterone and low LH
Low progesterone and high LH
A pharmaceutical company is developing a new contraceptive pill that specifically targets the LH surge. Which of the following mechanisms would be the MOST effective strategy for this contraceptive?
Inhibiting the positive feedback loop between estrogen and LH
Stimulating progesterone receptors in the hypothalamus
Blocking the release of GnRH from the hypothalamus
Increasing the negative feedback of progesterone on FSH secretion
A researcher is studying the effects of a novel compound on the menstrual cycle. Administration of the compound results in a prolonged luteal phase. Which of the following is the MOST likely mechanism of action of this compound?
Mimicking the action of hCG
Inhibiting progesterone synthesis
Blocking estrogen receptors in the endometrium
Promoting the degradation of the corpus luteum
A woman presents with heavy and prolonged menstrual bleeding (menorrhagia). Which of the following hormonal imbalances is LEAST likely to be a direct contributing factor to her condition?
Elevated FSH during the follicular phase
Inadequate progesterone secretion during the luteal phase
A persistently elevated estrogen level without sufficient progesterone opposition
Progesterone receptor insensitivity in the endometrium
Which of the following BEST describes the interplay of estrogen and inhibin B during the early to mid-follicular phase of the menstrual cycle?
Estrogen exerts negative feedback on FSH, while inhibin B specifically suppresses FSH secretion from the anterior pituitary
Both estrogen and inhibin B stimulate GnRH release from the hypothalamus
Estrogen promotes LH secretion, while inhibin B promotes FSH secretion
Both estrogen and inhibin B exert positive feedback on LH secretion
Which hormone is primarily responsible for the thickening of the uterine lining during the proliferative phase of the menstrual cycle?
Progesterone
Luteinizing Hormone (LH)
Follicle Stimulating Hormone (FSH)
Estrogen
The shedding of the uterine lining occurs during which phase of the menstrual cycle?
Proliferative phase
Secretory phase
Ovulatory phase
Menstrual phase
Approximately how long does the average menstrual cycle last?
14 days
21 days
28 days
35 days
Which hormone triggers ovulation?
FSH
Progesterone
Estrogen
Luteinizing Hormone (LH)
