Biology Nervous Coordination UHS 2023
PMDC Verified Question 37 of 86
During resting membrane potential condition:
A
Outer surface of neuron is more positive
B
Inner surface of neuron is more positive
C
Both of these surfaces are equally positive
D
Both of these surfaces are equally negative
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Outer surface of neuron is more positive
Concept:

The resting neuron is highly polarized due to the selective permeability of its membrane and active pumping mechanisms.

Solution:

  • Because of the massive abundance of \(\text{Na}^+\) ions pumped to the outside, and the presence of large, negatively charged proteins trapped inside the cell, the outer surface of the neuron is distinctly more positive relative to the negatively charged interior.


Why other options are incorrect:

  • Inner more positive: This state only occurs briefly during the peak of an active action potential (depolarization).


  • If surfaces were equal, voltage would be zero and impulse transmission would be impossible.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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