Distinguish between insulation by oligodendrocyte or Schwann cells. Relate myelination to signal speed.  Describe the myelin-related terms: neurilemma, nodes of Ranvier, internodes, nonmyelinated

Multiple sclerosis (MS) is a disorder that causes the destruction of myelin sheaths surrounding neurons. People with MS display many symptoms, including slurred speech, double vision, and poor muscle coordination. What is the direct effect of MS on nerve impulse transmission? Select one: The movement of impulses along neurons is slower than normal. Dendrites cannot be stimulated by acetylcholine, therefore impulses are not generated in neurons. The threshold level of stimulation for neurons is greater than normal. Axons cannot sectete acetylcholine, therefore impulses are not able to travel across synapses. O

Areas of myelinated axons create the appearance of  _______ matter, while neuron cell bodies and unmyelinated axons create the appearance of ______ matter.

Mention to the function of myelin sheath.