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In spinal cord motor information

The control of blood pressure and heart rate comes from the

The spinal cord is protected by the vertebra.

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