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MCAT Question A Day - 6/10/14 - Answer!

White matter in the brain and spinal cord appears white because:

A.  it contains large amounts of myelinated axons.
B.  it does not contain any myelinated axons.
C.  it is composed primarily of cell bodies.
D.  it contains a high concentration of white blood cells to protect the central nervous system from infection.

A is correct. White matter is composed primarily of myelinated axons.

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