Biology Nervous Coordination UHS 2023
PMDC Verified Question 36 of 86
In a typical nerve, the action potential duration is:
A
1 millisecond
B
1 microsecond
C
1 second
D
1 minute
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 1 millisecond
Concept:

Neural communication relies on extreme speed to allow for rapid reactions.

Solution:

  • A complete action potential—from initial depolarization through repolarization and the refractory undershoot—is an incredibly brief electrical event lasting approximately 1 millisecond (\(10^{-3}\) seconds).


Why other options are incorrect:

  • 1 microsecond: Far too fast for ion channels to mechanically open and close.


  • 1 second / 1 minute: Impossibly slow, which would cause severe biological lag and paralysis.

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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