Nerve Impulses/Action Potential

Nerve Impulses/Action Potential

Author: Aaron Mullally

This lesson will examine how signals are sent amongst nerve cells to carry out a response.

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Terms to Know
Action Potential

A nerve impulse.

Conducting Zone

The part of the neuron that consists of the axon where action potentials propagate away from the trigger zone toward the axon endings.

Input Zone

The region of a neuron where signals enter.

Output Zone

The part of the neuron that consists of the axon endings where signals are sent on to another neuron or to a gland or muscle cell.

Resting Potential

The steady voltage difference that occurs across a neuron’s membrane when it is not being stimulated.

Sodium Potassium Pump

A protein that pumps sodium potassium against their concentration gradients to restore the resting membrane potential following an action potential.


The minimum voltage shift across a membrane required for an action potential to take place.

Trigger Zone

The part of the neuron located at the base of the cell body that initiates action potentials.