Biology II - Nervous System: Action Potential

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Biology II

5 Terms

1
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membrane potential

a difference in charge between the inside and outside of the cell

due to ions

cells are naturally negative due to DNA

2
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concentration gradiant

a difference in the concentration of ions on the inside and outside of a cell

causes ions to flow through channels to reach equilibrium

3
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voltage-gated channels

require only an impulse to open

4
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sodium-potassium pump

requires ATP to open

pump 3 sodium out and 2 potassium in

5
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action potential

quick electrical messages that travel down the axon of a neuron

reverses charge of axon from negative to positive

carries impuse to next neuron