All of the following statements about glutamate receptors are true EXCEPT:
A. calcium ions normally block this channel
B. they can be ionotropic or metabotropic in type
C. activation of the NMDA receptor alone causes little voltage change
D. current through NMDA receptors is greater when the neuron is already depolarized
E. activation of the NMDA receptor can cause ionic current carried by calcium ions
Answer: A. calcium ions normally block this channel
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