Chapter 9a Part 2

What are the gaps in the myelin sheath called?

• Nodes of Ranvier

• Gap junctions

• Synapses

• Neurofibrils

What type of neurons are only found in specialized parts of the eyes, nose, and ears?

• Motor neurons

• Multipolar neurons

• Unipolar neurons

• Bipolar neurons

What structural type of neuron includes most neurons whose cell bodies lie within the central nervous system?

• Sensory neurons

• Multipolar neurons

• Bipolar neurons

• Unipolar neurons

What structural type of neuron has a single process that extends from the cell body?

• Unipolar neurons

• Multipolar neurons

• Bipolar neurons

What type of neurons conduct impulses into the brain or spinal cord?

• Interneurons

• Motor neurons

• Sensory neurons

What is the functional classification of neurons that are entirely contained within the brain or spinal cord?

• Sensory neurons

• Motor neurons

• Interneurons

What state is caused by unequal distribution of positive and negative charges across the plasma membrane of a neuron?

• Polarization

• Neurulation

• Potentiation

• Neutralization

What is the most abundant cation within neuronal cell?

• Potassium

• Hydrogen

• Calcium

• Sodium

In a resting neuron, what is the difference in charges between the outside and inside of the membrane called?

• Retrograde potential

• Resting potential

• Graded potential

• Action potential

What happens to a neuron when the membrane becomes more permeable to sodium?

• The neuron repolarizes.

• The neuron depolarizes.

• The neuron becomes polarized.

• The neuron hyperpolarizes.