Oligodendrocytes are the most abundant of the glial cells.

Nerve fibers are insulated from one another by ________.

The phrenic nerve emerges from the sacral plexus.

Receptors respond to commands from the effectors.

Norepinephrine binds to muscarinic receptors.

In the brain, gray matter surrounds white matter.

An anticholinergic drug is considered parasympatholytic.

Oligodendrocytes are the most abundant of the glial cells.

During an action potential, Sodium exits the cell causing the membrane potential to become more negative.

Norepinephrine binds to muscarinic receptors.