Lipoprotein described as essential for the protection of nerves. Which substance is this?

Lipoprotein described as essential for the protection of nerves. Which substance is this?

• A. Myelin
• B. Hemoglobin
• C. Collagen
• D. Elastin

Answer: (A)

Myelin is the lipid-rich protective sheath that wraps around many nerve fibers, insulating them so electrical signals travel quickly and efficiently. This insulation prevents leakage of current and enables saltatory conduction, where impulses jump quickly from one node of Ranvier to the next, speeding up communication along the nerve. By shielding the axon from surrounding environments, myelin also helps protect the nerve fiber from damage. Myelin is produced by Schwann cells in the peripheral nervous system (and by oligodendrocytes in the central nervous system), highlighting its crucial role in maintaining nerve function. The other substances listed serve different functions—hemoglobin carries oxygen in the blood, collagen provides structural strength in tissues, and elastin gives elasticity—so they don’t contribute to nerve insulation and protection in the way myelin does.

Myelin is the lipid-rich protective sheath that wraps around many nerve fibers, insulating them so electrical signals travel quickly and efficiently. This insulation prevents leakage of current and enables saltatory conduction, where impulses jump quickly from one node of Ranvier to the next, speeding up communication along the nerve. By shielding the axon from surrounding environments, myelin also helps protect the nerve fiber from damage. Myelin is produced by Schwann cells in the peripheral nervous system (and by oligodendrocytes in the central nervous system), highlighting its crucial role in maintaining nerve function. The other substances listed serve different functions—hemoglobin carries oxygen in the blood, collagen provides structural strength in tissues, and elastin gives elasticity—so they don’t contribute to nerve insulation and protection in the way myelin does.