Download ADAM Nervous System Ion Channels Use this program only if you

ADAM Nervous System
Ion Channels
Use this program only if you need to review the differences between active and passive cell
channels and voltage-gated and chemically-gated channels.
Membrane Potential
1. What causes the outside surface of the cell membrane to be more positive?
2. The resting membrane potential in a neuron results from what ions moving and in what
directions?
3. What is the numerical value and unit for the resting membrane potential?
4. What is the “job” of the Na/K pump in a neuron membrane?
Action Potential
5. What is an action potential?
6. What causes the action potential?
7. What is depolarization?
8. Diagram the positive feedback loop that causes the rising phase of the action potential.
9. What two processes interrupt the positive feedback loop?
10. What is repolarization?
11. Summarize action potential by making a chart which shows the status of the channels during
each phase of action potential (Rest, Depolarization, Repolarization)
If this activity took you less than 40 minutes, you probably went through the CD too fast.
You may also want to view Nervous System II – Synaptic Transmission.