When the Postsynaptic Cell Is Not Depolarized,NMDA Receptors​

question 67

Multiple Choice

When the postsynaptic cell is not depolarized,NMDA receptors​ 

• A)allow both sodium and calcium to enter the cell. 
• B)are blocked by a molecule of calcium. 
• C)are blocked by a molecule of magnesium 
• D)allow potassium to leave the cell.

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