Sensory adaptation is

The organ of Corti is found within the 

In the spinal cord the ascending tract

The cavities of the brain are best called

The ion that enters the tip of the axon and triggers the release of the neurotransmitter is 

Voltage

The action of the sodium-potassium pump is

The part of the brain that secretes melatonin is the 

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

No one knows why we _________ but it is probably for a variety of reasons such as a random discharge of electrical activity, wish fulfillment, or the processing of emotions.