Exam 18: The Action Potential

The inability of neurons to generate only a part of an action potential is called

Closing of the K⁺ at the end of the action potential requires

The E_m for a cell is -70 mV and E_Cl is -80 mV. Increasing g_Cl should increase

The “overshoot” of the action potential means

Depolarization refers to

The first step in the nerve action potential from rest is

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?

The time after an excitation during which the cell cannot produce another action potential is called the

“Latency” refers to the

Opening of the inactivation gate of the Na channel

In most cells, Increasing g_K would cause

A cell has a resting membrane potential of -70 mV and E_Na = + 60 mV and E_K = - 90 mV. If g_Na >0 in this cell,

Repolarization of the nerve during the action potential is caused mainly by

In most cells, Increasing g_Na would cause

In the Hodgkin-Huxley explanation of the action potential, activation gates

At rest, the Na channel

Opening of the Na+ activation gates in motor neurons is caused by

The time after an excitation during which the cell can produce another action potential, but it requires a larger than normal stimulus, is called the