Which factor below normally prevents the calcium channel of the NMDA receptor from opening in response to only glutamate?
a. The channel is blocked by Mg2+ ions.
b. Glutamate requires the presence of glycine in order to open the channel.
c. The channel is blocked by sodium ions.
d. Glutamate requires the presence of GABA in order to open the channel.
e. Glutamate inhibits glycine activity.
Answer: a. The channel is blocked by Mg2+ ions.
Psychology
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