Action Potential

Elizabeth Westmacott
Flashcards by Elizabeth Westmacott, updated more than 1 year ago
Elizabeth Westmacott
Created by Elizabeth Westmacott almost 8 years ago
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Description

A-Levels Biology Flashcards on Action Potential, created by Elizabeth Westmacott on 06/12/2013.

Resource summary

Question Answer
A stimulus is received causing... ...some sodium voltage gated channels to open.
Sodium ions... ...diffuse into the axon through these channels.
Sodium ions are... ...positively charged.
They reverse... ...the potential difference across the membrane.
As the sodium ions diffuse into the axon... ...more sodium channels open.
The membrane is depolarised and now... ... the voltage-gated sodium ion channels close.
The voltage gated potassium ion channels... ...open and potassium ions diffuse out of the axon.
The axon is... ...repolarised.
The inside of the axon becomes more negative than usual... ...which is known as hyperpolarisation.
The potassium ion channels close and the sodium-potassium pumps... ...cause sodium ions to be pumped out and potassium ions in.
The... ...resting potential is re-established.
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