Oligodendrocytes produce myelin sheaths in the PNS.

Divisions of the cerebral hemispheres that are named after the overlying skull bones are

The channels responsible for the rapid depolarization during action potentials are

Which of the following is true about threshold for an action potential?

________ neurons are the most common structural class in the CNS.

Inadequate levels of the neurotransmitter __________ may be responsible for many cases of severe chronic depression.

A brain hemorrhage is life-threatening because

Repolarization of the action potential begins when

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

Reflexes can be classified according to all of the following except