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Nerve Impulses. Resting Potentials Electrical potential across plasma membrane of a cell Not conducting impulse.

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Presentation on theme: "Nerve Impulses. Resting Potentials Electrical potential across plasma membrane of a cell Not conducting impulse."— Presentation transcript:

1 Nerve Impulses

2 Resting Potentials Electrical potential across plasma membrane of a cell Not conducting impulse

3 Action Potentials Reversal & restoration of electrical potential across the plasma memebrane of a cell Electrical impulse passes along it

4 Stages in Passage of Nerve Impulse Diffusion of sodium ions Local currents reduce resting potential

5 Depolarization Sodium channels open Sodium ions diffuse into neuron

6 Repolarization Potassium channels open after short delay Potassium ions diffuse out of neuron

7 Ion Movements Concentration gradient of Na & K are restored Restores resting potential Ready to conduct next nerve impulse

8 Page Number & Vocabulary Study Guide: p.53 Course Companion: p.240-243 HL Pearson: p.176-178 Resting Potential: electrical potential across plasma membrane of cell that is not conducting impulse Action Potential: reversal and restoration of electrical potential across plasma membrane of cell, as electrical impulse passes along it

9 Vocabulary Depolarization: change in cell’s membrane potential, making more positive Repolarization: change in membrane potential that returns membrane potential to negative value after depolarization phase of action potential has just previously changed membrane potential to positive value


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