Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
myelin sheath a. | transmits
impulses from one neuron to another. | b. | insulates synapses. | c. | nourishes
neurons. | d. | insulates axons. | | |
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2.
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When
an impulse moves down the axon, a. | sodium ions first rush out of the
cell. | b. | a small part of the axon momentarily reverses its
polarity. | c. | the resting potential of the cell does not
change. | d. | potassium ions are pumped into the
axon. | | |
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3.
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When
a neurotransmitter is released from a presynaptic neuron, the neurotransmitter may a. | become an enzyme
in the space between the neurons. | b. | bind to membrane receptor proteins on the membrane of the
postsynaptic neuron. | c. | cover the membrane of the axon. | d. | cause the cell
body of the postsynaptic neuron to enlarge. | | |
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4.
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Refer
to the illustration above. The effect of the neurotransmitter might be prolonged by the presence of
molecule
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5.
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Narcotics affect the nervous system’s control of pain perception
by a. | blocking
dopamine reabsorption. | c. | inhibiting
dopamine production. | b. | mimicking cocaine. | d. | mimicking enkephalins. | | | | |
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