Which of the following is the best description of the cause of multiple sclerosis (MS) ?

A) gradual death of brain cells due to calcium influx
B) damage to myelin impairs normal coordination of impulses
C) synaptic uptake of dopamine is inhibited
D) degeneration of dopamine-releasing neurons in the brain
E) excessive excitatory signals from the motor cortex

Multiple Sclerosis

A chronic autoimmune disease that affects the central nervous system, leading to demyelination, inflammation, and often, neurological disabilities.

Myelin

A fatty substance that surrounds and insulates the axons of many neurons, facilitating the rapid transmission of nerve impulses.

Calcium Influx

The process of calcium ions entering a cell, which can trigger various cellular activities including muscle contraction and neurotransmitter release.