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Resting Potential
Factor which influence
| Question | Answer |
|---|---|
| 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
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