Biology Nervous Coordination ETEA 2023
PMDC Verified Question 45 of 86
Which type of nerve impulse occurs in non-myelinated neuron fibers?
A
Saltatory impulse
B
Jumping impulse
C
Rapid impulse
D
Continuous impulse
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Continuous impulse
Concept:

The presence or absence of myelin radically alters how an action potential propagates along the axon membrane.

Solution:

  • In non-myelinated neurons, voltage-gated channels are distributed evenly along the entire length of the axon. The action potential must depolarize every single adjacent patch of the membrane consecutively, resulting in a continuous impulse.


Why other options are incorrect:

  • Saltatory / Jumping impulse: These describe the highly rapid propagation in myelinated fibers, where the signal "jumps" between the nodes of Ranvier.


  • Rapid impulse: Continuous conduction is comparatively very slow, not rapid.

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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