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

question 28

Multiple Choice

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?
I.Action potentials move in the opposite direction on the axon.
II.Action potentials move more slowly along the axon.
III.No action potentials are transmitted.

• A)only I
• B)only II
• C)only III
• D)only II and III
• E)I, II and III

---

Definitions:

Acetylcholine

A neurotransmitter in both the central and peripheral nervous systems that plays a role in muscle contraction and various cognitive functions.

Neurotransmitter

Chemical substances used by neurons to transmit signals across synapses to other neurons, muscles, or glands.

Memory Loss

The inability to remember information or experiences, which can be temporary or permanent, and is often a symptom of neurological conditions or damage.

Atkinson and Shiffrin Model

A theory of memory proposed in 1968, suggesting that memory consists of three stores: a sensory register, short-term memory, and long-term memory.