Which of the following is TRUE regarding myelination?
A) myelination begins prenatally and continues for years after birth.
B) Myelination helps nerve impulses travel faster.
C) The myelin sheath insulates the nerve cell.
D All of these.
I think the answer is A but then i thinks its D.
D) All of these.
You are correct to consider both option A and option D as potential correct answers. To determine the true statement regarding myelination, let's evaluate each option and see if it aligns with the concept of myelination.
Option A states that myelination begins prenatally and continues for years after birth. This is true as myelination is a process that starts during fetal development and continues throughout childhood and adolescence. Myelin is actively produced during this time to support the growth and maturation of the nervous system.
Option B claims that myelination helps nerve impulses travel faster. This is also true. The main function of myelin is to insulate the nerve cells, forming a protective sheath around them. This insulation aids in speeding up the conduction of electrical signals (nerve impulses) along the nerve fibers. In other words, myelination enhances the efficiency and speed at which nerve impulses can travel through the nervous system.
Option C states that the myelin sheath insulates the nerve cell. This is also accurate. The myelin sheath acts as an insulator, preventing the leakage of electrical signals between adjacent nerve cells and enhancing the conduction of nerve impulses along the nerve fiber.
Considering all these points, the correct answer is indeed option D: All of these. Both option A, which describes the timeline of myelination, and options B and C, which describe the functional aspects of myelin, are true statements regarding myelination.
The correct answer is D) All of these.
A) Myelination begins prenatally and continues for years after birth: Myelination is a process that starts during fetal development and continues for a certain period after birth. It is a gradual process that occurs as the nervous system matures.
B) Myelination helps nerve impulses travel faster: Myelin, the insulating layer around nerve fibers, acts as a sort of "electrical insulation" and allows nerve impulses to travel more efficiently and at a faster speed along the nerve fibers.
C) The myelin sheath insulates the nerve cell: The myelin sheath is a protective layer that surrounds the axon of a nerve cell. It provides insulation, preventing electrical signals from leaking out and maintaining the efficiency of nerve impulse transmission.
Therefore, all of these statements are true regarding myelination.