Biology Nervous Coordination MDCAT 2015
PMDC Verified Question 83 of 86
Conduction of action potentials from one node of Ranvier to another in myelinated neurons is through:
A
Hyperpolarization
B
Depolarization
C
Resting Membrane Potential
D
Saltatory conduction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Saltatory conduction
Concept:

Myelin acts as a high-resistance electrical insulator, forcing the action potential to "skip" down the axon.

Solution:

  • In myelinated axons, ion channels are concentrated at the nodes of Ranvier. The electrical impulse jumps from node to node, a highly efficient and rapid process known as saltatory conduction (from the Latin saltare, to jump).


Why other options are incorrect:

  • Depolarization / Hyperpolarization: These are phases of the action potential itself, not the mechanism of propagation along the axon length.

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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