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Multiple Choice
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1

Neurons, or nerve cells, are the basic elements of the nervous system. You have perhaps as many as _________ neurons throughout your body..
A)157 million
B)1 billion
C)1 trillion
D)10 trillion
2

Which of the following is not part of a neuron’s internal structure?
A)dendrite
B)glial cell
C)axon
D)nucleus
3

A myelin sheath cannot
A)prevent messages from short-circuiting one another.
B)increase the velocity with which the electrical impulses (that carry the messages) travel through the axons.
C)insulate axons.
D)fire neurons.
4

Just after an action potential has passed through a section of the axon, the cell membrane in that region cannot admit positive ions again for a few milliseconds, and so
A)the neuron cannot fire again immediately.
B)a second impulse travels along the axon more slowly.
C)the neuron will fire again immediately.
D)the neuron is in a normal resting state.
5

A chemical connection bridges the gap, known as a(an) _______, between two neurons.
A)action potential
B)myelin sheath
C)positive ionic connection
D)synapse





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