________ neurons form the afferent division of the PNS.

Oligodendrocytes produce myelin sheaths in the PNS.

Chambers within the brain that contain cerebrospinal fluid are called

A brain hemorrhage is life-threatening because

The efferent division of the peripheral nervous system innervates ________ cells.

Repolarization of the action potential begins when

The inner surface of the cell membrane contains an excess of __________ with respect to the outer surface.

________ neurons are short, with a cell body between dendrite and axon, and occur in special sense organs.

________ nerves are nerves that connect to the brain.

The channels responsible for the rapid depolarization during action potentials are