MCAT Question of the Day
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    Q:

    		 The spinal cord is composed of two structurally different tissues. Gray matter lies internal to white matter in the spinal cord. What accounts for the differences in color of these two tissues?
    		 

    A

    		 White matter is mainly composed of oligodendrocytes, which appear white to the naked eye.

    B

    		 Gray matter is much more highly condensed, giving it a gray look.

    C

    		 White matter axons are not myelinated while gray matter axons are.

    D

    		 Gray matter axons are not myelinated while white matter axons are.



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