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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.

Greg regularly only sleeps 6 hours a night and drives long distances often. Due to his lack of sleep he is 2x more likely to _____________. 

We get our most restful sleep and experience almost all of our dreams during our ___________ cycle of sleep.

Alyssa wakes up early and feels very awake and conscious throughout her morning. In the middle of the afternoon she notices her consciousness is beginning to drift and she feels sleepy.  Later in the day she starts to feel more energized. This is all part of her ___________.