Phet Action Potential

Click the "+" button to zoom in. What protein structures are embedded in the membrane?  

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What substance is there more of outside the neuron? (Click “Show concentrations” if you are unsure).

• K+

• Na+

What substance is there more of inside of the neuron at rest?

• K+

• Na+

What is the charge of the inside of the cell? (Click “Show charge”)

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What is the charge of the outside of the cell? (Click “Show charge”)

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If K+ and Na+ are both positive, how is it possible to have a negative charge?

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Zoom out and click "slow motion," then click “Stimulate neuron.”  Describe what you saw.

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Which way did Na+ move?

• In to the cell

• Out of the cell

Which way did K+ move?

• In to the cell

• Out of the cell

Na+ and K+ move through ________ to get in and out of the cell.