Under Most Conditions, NMDA Receptors Do NOT Respond to Their

question 51

Multiple Choice

Under most conditions, NMDA receptors do NOT respond to their neurotransmitter because:

• A) magnesium ions block the passage of calcium through the receptor's channel.
• B) too many sodium ions enter through the AMPA channels.
• C) any recent depolarization of the membrane inactivates the NMDA receptors.
• D) the channel can open only when the potassium concentration inside the neuron exceeds a certain high level.