Biology Nervous Coordination MDCAT 2018
PMDC Verified Question 79 of 86
When a nerve impulse jumps from one node of Ranvier to the next in a myelinated neuron, it is called
A
Saltatory conduction
B
Resting potential
C
Synapses
D
Membrane potential
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Saltatory conduction
Concept:

Myelination alters how action potentials propagate, making the nervous system highly efficient.

Solution:

  • Because the myelin sheath prevents ion leakage, depolarization can only occur at the exposed gaps known as Nodes of Ranvier. The impulse appears to "leap" from node to node, a phenomenon strictly termed saltatory conduction.


Why other options are incorrect:

  • Resting / Membrane potential: Refer to voltage states, not the physical movement of the impulse.


  • Synapses: The junction between two entirely separate cells.

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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