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When one neuron’s axon brings a signal to a second neuron;s dendrites, the area of juncture is best called

Depolarization occurs as Na+ gates open letting sodium ions into the cell.

In the spinal cord the ascending tract

All or none phenomenon indicates that a stimulus either causes a complete depolarization to action potential or nothing happens.

The protective membranes of the central nervous system are best called

In spinal cord the white matter in centermost and the gray matter is outermost.

Most people do not realize that a child who repeatedly ______________ has a sleep disorder. 

______________ are a type of chemical that _______ the activity of the central nervous system.

When Jeannette has had too many drinks she insists she knows how to drive her car. She absolutely does, in fact, know how to drive. However, the alcohol ______________ her nervous system  making her reflexes ___________.

There are ______ stages of sleep that we cycle through several times during the night.