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Title: Transmission of an Action Potential
Description: The process in order with values e.g. of depolarisation, threshold etc- a great revision tool
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NadiaA

Transmission of Action Potentials

1
...
Depolarisation
 Sodium voltage gated channels open
 This is an example of positive feedback;
 Na+ come into the plasma membrane
 Inside of plasma membrane becomes more positive, respectively to the outside
 More Na+ come in
 So more sodium channels open
 More Na+ come in (like a domino effect- this is where local currents apply to
transmit the info in one direction)
 About -50mV is reached

NadiaA

3
...
Hyperpolarisation
 There is an efflux of K+ as the potassium channels are slow to close
 The inside of the membrane increases in negative charge, below the resting
potential

5
...


Title: Transmission of an Action Potential
Description: The process in order with values e.g. of depolarisation, threshold etc- a great revision tool
Buy These NotesPreview