Before You Begin
Question #46906
The Question
Read the following statements regarding the neuroendocrine mechanism of parturition: I. The primary signal for parturition originates from the fully developed fetus and placenta, inducing the fetal ejection reflex. II. The fetal ejection reflex directly stimulates the maternal adenohypophysis to synthesize and release oxytocin. III. Administration of a competitive oxytocin receptor antagonist to the mother will halt the positive feedback loop but will not prevent the initial mild uterine contractions. IV. Oxytocin acts on the uterine myometrium, and the resulting stronger contractions stimulate further oxytocin secretion.
Choose the correct option:
Options
- A.
Statements I, III, and IV are correct
- B.
Statements I, II, and IV are correct
- C.
Only statements II and III are correct
- D.
Only statements I and IV are correct
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
Parturition Neuroendocrine Reflex|Adenohypophysis vs Neurohypophysis Origin|Consciousness Complexity
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between the initiation of the reflex (fetal/placental origin) and its amplification (maternal neurohypophyseal oxytocin).
A common trap is confusing the adenohypophysis with the neurohypophysis for oxytocin release, and assuming an oxytocin blocker would stop the initial fetal ejection reflex itself, rather than just the subsequent positive feedback loop.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | The Living World - Class 11 |
| Concept | Consciousness Complexity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |