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Question #45398
The Question
A female patient with primary infertility undergoes successful ovulation induction, releasing a secondary oocyte. Her partner's semen analysis shows normal sperm count and motility. However, in vivo fertilization fails. Tubal fluid analysis reveals a severely deficient secretory environment due to a blunted estrogen response during the follicular phase. What is the primary physiological reason the structurally normal, motile sperm fail to fertilize the oocyte in this specific environment?
Options
- A.
The sperm fail to synthesize hyaluronidase and acrosin due to the lack of estrogenic stimulation in the fallopian tube.
- B.
The sperm cannot undergo capacitation because inadequate female tract secretions prevent cholesterol efflux and subsequent Ca2+ influx.
- C.
The sperm lose their initial motility because the acidic pH of the vagina is not neutralized by estrogen-dependent prostatic secretions.
- D.
The sperm undergo a premature acrosome reaction in the uterus due to the absence of decapacitation factors normally provided by estrogen.
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
Sperm Capacitation Location|Hormonal Feedback Loops|Calcium Homeostasis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that 'capacitation occurs in the female tract' but fail to link it to the hormonal dependency of the tract's microenvironment.
The trap relies on confusing the origin of reproductive secretions and enzymes.
Students must distinguish between structural maturation (epididymis), enzyme synthesis (testis), and biochemical capacitation (estrogen-primed female tract).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Sperm Capacitation Location |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |