Biology Nervous Coordination SZABMU 2024 Reconduct
PMDC Verified Question 19 of 86
Nerve impulse conducted from one node of Ranvier to another skipping the myelinated regions moves up to ____ times faster than unmyelinated axons:
A
30
B
100
C
120
D
50
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 50
Concept:

Saltatory conduction provides a massive evolutionary advantage in reaction speed.

Solution:

  • Because the myelin sheath insulates the axon and restricts ion exchange solely to the nodes of Ranvier, the action potential functionally "skips" down the axon. This mechanism is universally taught to allow impulses to travel up to 50 times faster than the continuous wave of depolarization seen in naked, unmyelinated axons of similar diameter.


Why other options are incorrect:

  • Options 30, 100, and 120 deviate from the standard textbook physiological metric established for this comparison.

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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