Answer:
Myelin, Multiple sclerosis and autoimmune disease.
Explanation:
The neuron is the main structural and functional unit of the nervous system. The neurons that are covered with the myelin sheath shows fats conduction of the nerve impulse than the unmyelinated neuron.
The myelin sheath is made of the lipids. Multiple sclerosis is the disease of the central nervous system that affects the coordination ability and movement of an individual. The myelin sheath gets damaged in the multiple sclerosis. The autoimmune disease may be defined as the disease in which the body starts attacking its own cells. In case of multiple sclerosis, because the immune cells of the body start attcking each other.
Thus, the answer is myelin, multiple sclerosis and autoimmune disease.