Nervous System Quiz

The neuron processes that normally receives incoming stimuli are called:

• axons
• dendrites
• neurolemmas
• Schwann cells
• satellite cells

Collections of nerve cell bodies inside the PNS are called:

• ganglia
• tracts
• nerves
• nuclei
• tracts or ganglia

Which of the following best describes the waxy-appearing material called myelin:

• an outermembrane on a neuroglial cell
• a lipid-protein (lipoprotein) cell membrane on the outside of axons
• a mass of white lipid material that surrounds the cell body of a neuron
• a mass of white lipid material that insulates the axon of a neuron
• a mass of white lipid material that surrounds the dendrites of a neuron

A neuron with a cell body located in the CNS whose primary function is connecting other neurons is called a(n):

• efferent neuron
• afferent neuron
• interneuron
• glial cell
• satellite cell

White matter refers to myelinated fibers in the:

• CNS
• PNS
• ANS
• SNS
• both ANS and SNS

Impulse conduction is fastest in neurons that are:

• myelinated
• unmyelinated
• sensory
• motor
• cerebral

An action potential:

• is essential for nerve impulse propagation
• involves the influx of negative ions to depolarize the membrane
• involves the outflux of negative ions to depolarize the membrane
• involves the outflux of positive ions to depolarize the membrane
• is initiated by potassium ion movements

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid:

• sodium
• chloride
• calcium
• potassium
• magnesium

The ability to respond to a stimulus is termed:

• polarized
• irritability
• depolarized
• conductivity
• all-or-none response

Which one of the following is the correct sequence of events that follows a threshold potential:1. the membrane becomes depolarized 2. sodium channels open and sodium ions diffuse inward 3. the membrane becomes repolarized 4. potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell

• 3,2,4,1
• 2,1,4,3
• 2,1,3,4
• 1,2,4,3
• 4,1,3,2