In multiple sclerosis, the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. How does multiple sclerosis manifest at the level of the action potential?
A) Action potentials move in the opposite direction on the axon.
B) Action potentials move more slowly along the axon.
C) No action potentials are transmitted.
D) Action potentials grow stronger as they move down an axon.

Question

Quizplus · Accepted Answer

In multiple sclerosis, the damage to myelin sheaths impairs their normal function of insulating axons and facilitating the rapid transmission of electrical impulses. This results in action potentials moving more slowly along the axon, as the demyelination disrupts the efficient propagation of these signals.

In Multiple Sclerosis, the Myelin Sheaths Around the Axons of the Brain