You are studying electrical currents in cortical neurons. In a particular experiment, you notice that current doesn't flow into the cell until the cell has been depolarized. Current flows normally when the solution that bathes the cell is free of magnesium. The current is likely passing through

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Quizplus · Accepted Answer

NMDA receptors are known to be voltage-dependent and are blocked by magnesium ions at resting membrane potential. When the cell is depolarized, the magnesium block is relieved, allowing current to flow through the NMDA receptor channels. This characteristic does not apply to AMPA receptors or metabotropic glutamate receptors, which are not voltage-dependent in the same way.

You Are Studying Electrical Currents in Cortical Neurons