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Question #46905
The Question
A patient in a deep coma is declared clinically 'brain-dead' due to irreversible damage to the brain stem. Despite this, the patient's heart continues to beat rhythmically without external pacing, though they require a mechanical ventilator to breathe and have lost the micturition reflex. Which of the following statements is NOT correct regarding this patient's physiological state?
Options
- A.
The rhythmic beating of the heart is maintained because the auto-excitable Sinoatrial (SA) node generates action potentials independent of the brain stem.
- B.
The loss of the micturition reflex occurs because the CNS fails to process afferent signals from bladder stretch receptors and initiate efferent motor responses.
- C.
The patient lacks self-consciousness, a defining property exclusive to humans, which creates ambiguity in classifying them strictly as a living organism.
- D.
The inability to breathe independently is due to the failure of the pneumotaxic and respiratory rhythm centers located in the cerebrum.
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
Defining Properties Criteria|Action Potential Threshold Logic|Micturition Reflex Control
Why This Question Is Tricky
Common Mistakes
Location Trap & Cross-Chapter Synthesis.
The conceptual pivot is the exact anatomical location of autonomic control centers.
Students often attribute critical life-sustaining functions broadly to the 'brain' or 'cerebrum', forgetting that respiratory drives (Medulla/Pons) are strictly brain stem functions.
Furthermore, it integrates the philosophical biology of 'Consciousness' from Chapter 1 with human neurophysiology and excretory reflexes.
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 |