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Plasma Membrane
A biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.
Permeable
A characteristic of materials that are able to allow liquids or gases to pass through them, especially through pores or interstices.
Gray Matter
The darker-colored area of the central nervous system; abundant in nerve cell bodies, dendrites, and axon terminals, associated with processing and cognition.
Myelination
The process of forming a myelin sheath around nerves, enabling faster electrical impulse transmission.
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