Question

The myelin on myelinated neurons can be degraded or destroyed in diseases such as multiple sclerosis-a process called demyelination. If a myelinated neuron was affected by demyelination, how would this affect action potentials in that neuron?

A. Action potentials would propagate in both directions along the axon.
B. Initial generation of action potentials would be more difficult.
C. The speed of action potential propagation would be faster.
D. The speed of action potential propagation would be slower.

Answer 1

Answer:

D

Explanation:

Demylination is a neural disease caused due to degradation of  myelin or myelination neurons.

This damage impairs the conduction of signals in the affected neurons. This reduction in conduction ability causes deficiency in sensation, movement, cognition and  other depending upon the neuron it has affected. In general the The speed of action potential propagation would be slower. Hence option D is the correct answer.