Unit 6.2 Action Potentials

Front

In resting potential, neurons have more _________ on the outside of the cell membrane.

Back

Na+

Front

The charge on sodium and potassium ions is __________.

Back

both are positive

Front

As the neuron fires, there's a reversal in _____ as the axon undergoes ________.

Back

charge, depolarization

Front

What number on the graph represents the Repolarization phase?

Back

3

Front

When is the potassium channel open?

Back

during repolarization only

Front

What is the resting potential of a neuron?

Back

Approximately -70 mV.

Front

What happens during depolarization?

Back

Sodium channels open, allowing Na+ to enter the neuron.

Front

What is the role of potassium ions during repolarization?

Back

K+ ions exit the neuron, restoring the negative charge inside.

Front

Define action potential.

Back

A rapid change in membrane potential that propagates along the axon.

Front

What triggers the action potential?

Back

A stimulus that depolarizes the membrane to the threshold level.