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Question #47457
The Question
Chronic psychological stress can induce secondary amenorrhea and anovulation by inhibiting the pulsatile secretion of hypothalamic GnRH. Which of the following represents the precise downstream physiological mechanism by which the LH surge is prevented in this condition?
Options
- A.
The lack of FSH prevents the maturation of the Graafian follicle, resulting in sub-threshold estrogen levels that fail to exert positive feedback on the anterior pituitary.
- B.
The absence of LH prevents the corpus luteum from secreting adequate progesterone, which is required to trigger the positive feedback loop for ovulation.
- C.
Low GnRH levels directly stimulate the anterior pituitary to secrete prolactin, which competitively binds to LH receptors on the ovarian follicles.
- D.
The primary oocyte remains arrested in Prophase I due to the absence of an estrogen surge, preventing the completion of meiosis I.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
GnRH|Estrogen|Progesterone|Corpus Callosum Functionality
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Understanding the dual feedback nature of estrogen and the sequence of the ovarian cycle.
Students often confuse the roles of estrogen and progesterone, or fail to link follicular maturation directly to the estrogen threshold required for the LH surge.
The trap in Option B relies on confusing pre-ovulatory and post-ovulatory hormonal drivers, while Option D confuses the hormone responsible for un-arresting the oocyte.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Neural Control and Coordination - Class 11 |
| Concept | Corpus Callosum Functionality |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |