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Question #46335
The Question
A premature infant born at 28 weeks of gestation develops severe respiratory distress due to a deficiency of alveolar surfactant (lecithin). Which of the following physiological consequences is INCORRECT regarding this condition?
Options
- A.
High alveolar surface tension causes atelectasis, leading to a severe ventilation-perfusion mismatch.
- B.
Accumulation of CO2 in the blood lowers the pH, shifting the Oxygen-Hemoglobin dissociation curve to the right.
- C.
The rightward shift of the dissociation curve increases hemoglobin's affinity for O2, facilitating better oxygen loading in the lungs.
- D.
Peripheral chemoreceptors detect the hypercapnia and signal the respiratory rhythm centre to increase the ventilation rate.
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
Surfactant Function|Neural Regulation Feedback|Oxygen-Hemoglobin Dissociation Curve
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize 'Right shift = Bohr effect = Good for tissue oxygenation' but fail to apply it to the pulmonary level.
The trap relies on the misconception that a compensatory right shift improves oxygen uptake.
In reality, decreased O2 affinity hinders loading at the alveoli, making Option C the incorrect statement.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Breathing and Exchange of Gases - Class 11 |
| Concept | Surfactant Function |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |