_play an important role in communication between neurons, produce the material that insulates neurons, and aid cell matabolism

Answer;

-Glial cells

Explanation;

-The glial cells surround neurons and provide support for and insulation between them. They are the most abundant cell types in the central nervous system.

The Glial cells have a primary function of holding the CNS together; plays an important role in communication between neurons, produces the material that insulates neurons (myelin), aid cell metabolism.

Additionally, they help form blood-brain barrier, play a key role in the control of breathing, regulate neuronal transmission, & may play an important role in repair after brain injury.

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c) up is the direction the magnetic force is acting on the charge.