Multiple Choice
Suppose that after an action potential we clam p the membrane potential at -50 mV and don’t let it completely repolarize. We find that we cannot elicit an action potential. This is called a depolarization block. What causes it?
A) Persistently elevated gK
B) The inactivation gates do not re-open
C) The activation gates of the Na channel are closed
D) Persistently elevated gNa
E) The inactivation gates are stuck open
Correct Answer:
Verified
Correct Answer:
Verified
Q2: Closing of the K<sup>+</sup> at the end
Q3: The E<sub>m</sub> for a cell is -70
Q4: The “overshoot” of the action potential means<br>A)
Q5: Depolarization refers to<br>A) Making the membrane potential
Q6: The first step in the nerve action
Q8: The time after an excitation during which
Q9: “Latency” refers to the<br>A) Delay between increase
Q10: Opening of the inactivation gate of the
Q11: In most cells, Increasing g<sub>K</sub> would cause<br>A)
Q12: A cell has a resting membrane potential