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Topic 6
Action potentials
| Term | Definition |
|---|---|
| What is an action potenital | This is when the neruones voltage increases beyond a set point from the resting potential. This is due to membrane becoming more permeable to Na+ |
| What is the all or nothing principle | Action potential is only generated when threshold is reached High pressure is above threshold |
| What is meant by a refactory peroid | After an action potential has been generated the membrane enters a refactory peroid when it cant be stimulated because sodium channels are recovering and cant be opened |
| Why is the refactory peroid important | 1. It ensures discrete imlulses are produced meaning that an action potential cannot be generated immediatley after another one to make sure that each is seperate from another |
| 2. It ensures that action potentials travel in one direction. This stops the action potential from spreading out in two different directions which would prevent a response | |
| 3. It limits the number of impulse transmission. This is important to prevent over reaction to a stimulis and therefore overwhelming senses |
Created by:
yHya