In multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results.How does this disease 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)Action potentials are entirely negated.
D)All of the above occurs in multiple sclerosis.

Question

Quizplus · Accepted Answer

In multiple sclerosis, the myelin sheaths around the axons are damaged, which leads to a slower transmission of action potentials along the axon. This is because the myelin sheath acts as an insulator, allowing for the rapid conduction of action potentials. Without this insulation, the electrical signal is slowed down, resulting in a slower propagation of action potentials. There is no evidence that action potentials move in the opposite direction, and they are not entirely negated in multiple sclerosis.

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