Question

Use the terms below to complete each statement describing the events involved in an action potential. Then place the statements in the correct order.

At resting potential, voltage-gated ion channels are ____, but there is some diffusion of _____. In response to a stimulus, the cell begins to  ____________ . When the threshold voltage is reached, an action potential is produced.

With K+ channels ____, repolarization occurs. As K+ diffuses out of the axon, an _____ occurs before the resting potential is restored.

Rapid depolarization occurs because voltage-gated _____ channel activation gates open, allowing the ion to diffuse into the axon.

At the top of the spike, Na+_______ gates close, and voltage-gated potassium channels begin to open.

TERMS

K+; inactivation; open; hyperpolarization; Na+; undershoot; H+; closed; overshoot; depolarize; activation

Answer 1

1. Closed

2. K+

3. Depolarize

4.Overshoot

5. Hyperpolarization

6. Na+

7. Activation