Exam 2: Nerve Cells and Nerve Impulses

If there is a depolarizing effect on a neuron, the result will be that the neuron will fire:

The myelin sheath is interrupted periodically by short sections of axon called:

What type of glial cells myelinate axons in the brain and spinal cord?

What is the mechanism that prevents or slows some chemicals from entering the brain, while allowing others to enter?

The endoplasmic reticulum is a:

The resting potential of a neuron refers to:

The sodium-potassium pump is what normally brings the membrane back to its original state of polarization after the peak of the action potential.

What disease is related to the destruction of myelin sheaths?

The primary source of energy used by the brain is fat.

In what direction does a local neuron transmit information?

The neuron will produce an action potential only if the depolarization exceeds what level?

Dendrites often contain additional short outgrowths. These are believed to:

Radial glia:

Water, oxygen and ____ most freely flow across a cell membrane.

The function of a myelin sheath is to:

Which of the following is NOT governed by the all-or-none law?

The sites at which the cell synthesizes new protein molecules are called:

Electrical gradients lead to what kind of movements?

A small gap is usually present between neurons.

____ in the brain and spinal cord and ____ in the periphery are specialized types of glia that build the myelin sheaths that surround neurons.