Neurons that are deprived of oxygen for a prolonged period:
A. Release glycine, which inhibits the postsynaptic neurons and prevents neural function even in neurons not directly affected by the oxygen deprivation.
B. Become inactive and slowly regenerate.
C. Release glutamate, which causes overexcitation of the surrounding neurons.
D. A, B, and C
E. None of the above
ANS: C
Rationale: When a person suffers a stroke or traumatic injury, neurons in the brain that are deprived of oxygen for a prolonged period die and do not regenerate. Oxygen-deprived neurons release large quantities of glutamate, an excitatory neurotransmitter, from their axon terminals.
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