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Question #46908
The Question
Spatial awareness and the unified perception of 'self' rely on the precise summation of Excitatory Postsynaptic Potentials (EPSPs) and Inhibitory Postsynaptic Potentials (IPSPs) from both ipsilateral and contralateral sensory pathways in the cerebral cortex. If a neurotoxin selectively blocks the ligand-gated anion channels on the post-synaptic membranes of these integrative interneurons, which of the following statements is NOT correct regarding its physiological impact?
Options
- A.
The post-synaptic membrane will fail to undergo hyperpolarization, disrupting the temporal and spatial summation required for coherent sensory integration.
- B.
The neurotoxin directly inhibits the exocytosis of neurotransmitters from the pre-synaptic vesicles of the contralateral sensory neurons.
- C.
The affected interneurons will exhibit an increased frequency of action potentials due to unchecked depolarization.
- D.
The resting membrane potential of the post-synaptic neuron will be more easily driven towards the threshold by concurrent excitatory synapses.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Consciousness Complexity|Ipsilateral vs Contralateral Signaling|Summation Kinetics
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Location and Mechanism Trap.
Students often confuse neurotoxins that inhibit pre-synaptic neurotransmitter release (e.g., affecting voltage-gated Ca2+ channels or synaptic vesicles) with those that block post-synaptic receptors.
The question explicitly places the blockade at the post-synaptic anion channels, making any statement about pre-synaptic vesicle inhibition anatomically and mechanistically false.
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 |