Biol 303 Nervous System

Biol 303 Nervous System - Nervous System Class Notes Tne...

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Nervous System Class Notes  Tne role of voltage gated ion channels in the action potential Depolarizing and repolarizing Every action potential looks like this Specialized channels Sodium channels o Potassium out o Change membrane to reach threshold Sodium channels voltage sensitive Change voltage and channels open Positive charges (sodium) move into cell First to equalize charge against membrane bt then get  surpluss of positive charges into membrane (peak on grapp) Second gate at peak – stops flow of sodium Ions into cell, potassium  can move out at a higher rate than before (potassium was moving  out all along) Necessary for a fast repolarizaiton Repolarization when sodium pumped out 1 st  – sodium, depolarization 2 nd  – potassium, enhances rate at which repolarization takes place Excitable cells Undergo reversible electrical changes = action potentials 
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This note was uploaded on 05/20/2008 for the course BIOL 303 taught by Professor Birchard during the Spring '08 term at George Mason.

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Biol 303 Nervous System - Nervous System Class Notes Tne...

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