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Resting Potential

Factor which influence

What 2 factors influence Resting Potential? Ionic Concentration, Ionic Permeability
What are 2 ways Ionic Concentration can be changed? 1. changing Voltage 2. changing Electrochemical Equilibrium
What factor allows for greater permeability of Ions through a mambrane? open Gates
What is the definition of AP? a brief Depolarization, followed by a quick Repolarization = Electrical Impulse
What causes AP Depolarization? influx of Na+ (in)
What causes AP Repolarization? efflux of K+ (out)
What structure maintains the Resting Potential? Na/K Exchange Pump - requires ATP
What is the ratio for Active Transport to maintain Resting Potential? 3 Na+ OUT for every 2 K+ IN
What structure maintains the Resting Potential? Na/K Exchange Pump
Why is the Exchange Pump necessry? Na+ and K+ moving across membrane changes voltage - pump REGULATES charge
Whenever Na+ and K+ move across the membrane what happens to the membrane? concentration gradient is reduced becoming Depolarized
What would be the result if the membrane never returned to RP? no RP --> no ATP --> no Na/K Pump --> No AP sensory/motor --> death
What would be the result of an increase in Diffusional Force? ^ DF --> ^ Equilibrium Potential ^ Resting Potential
Created by: Kristel