Question

26. AMPA glutamate channels mainly allow for _______ to come across the membrane; however, the NMDA channels (at rest, -70 mV) are blocked by an ion of __________.

a. Na+; K+

b. K+; Li+

c. Na+; Mg2+

d. Na+; Ca2+

27. Relating back to question #26, if I were to depolarize the cell to, lets say, -50mV, the ion blocking the NMDA channel would be expelled from the pore and _________ along with _________ would be allowed to come into the neuron.

a. K+; Na+

b. Na+; Mg2+

c. Mg2+; Na+

d. Na+;

Answer 1

26. AMPA glutamate channels mainly allow for _______ to come across the membrane; however, the NMDA channels (at rest, -70 mV) are blocked by an ion of __________.

Answer

c. Na+; Mg2+

All of the ionotropic glutamate receptors are nonselective channels, allowing the passage of Na⁺ . however NMDA channels (at rest, -70 mV) are blocked by an ion of Mg2+ .it allow the passage of cations only when the Mg2+ block is not there.