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Rhodopsin 

The fluid found in the cavities of the brain is blood.

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.