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Describe the events that must occur to generate an action potential (AP).

Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon.

Include information on EPSP and IPSP.



Answer :

GinnyAnswer

Final answer:

The process of generating an AP involves depolarization towards threshold, opening of sodium and potassium channels, and changes in membrane permeability to Na+ and K+ ions.


Explanation:

Action Potential (AP) Generation:

  1. Stimulus causes the cell to depolarize towards the threshold potential.
  2. Sodium ion channels open, allowing Na+ influx and depolarization.
  3. Potassium ion channels open, allowing K+ efflux and repolarization.

Permeability Changes: Changing membrane permeability to Na+ or K+ ions leads to AP.

All-or-None Phenomenon: AP occurs if depolarization reaches threshold, ensuring consistent signal transmission.


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