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Question #45358
The Question
Parturition is induced by a complex neuroendocrine mechanism. Suppose a pathological condition in a pregnant female at full term severely inhibits the localized inflammatory cascade, drastically reducing prostaglandin secretion from the placenta and uterine tissues. Based on the principles of maternal-fetal physiology, which of the following represents the most likely combined outcome on the parturition reflex and fetal immunity?
Options
- A.
The positive feedback loop between uterine contractions and maternal oxytocin secretion will be blunted, delaying parturition, and the transfer of naturally acquired passive immunity (IgG) to the fetus may be compromised.
- B.
The fetal ejection reflex will shift to a negative feedback mechanism to accelerate parturition, while the trans-placental transfer of IgA for naturally acquired active immunity is enhanced.
- C.
Maternal oxytocin release will independently sustain maximal myometrial contractions, but the fetus will be deprived of naturally acquired active immunity mediated by maternal IgM.
- D.
The release of oxytocin from the fetal posterior pituitary will compensate for the lack of prostaglandins, ensuring normal delivery and uninterrupted transfer of maternal IgG.
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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
Oxytocin|Ferguson_Reflex|IgG|Placenta
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating the neuroendocrine positive feedback of parturition with immunology.
The trap relies on multiple common misconceptions: misattributing the source of oxytocin to the fetal pituitary instead of the maternal pituitary, confusing positive vs. negative feedback in labor, and failing to distinguish between placental IgG (passive immunity) and colostrum IgA or confusing passive with active immunity.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Hormonal Feedback Loops |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |