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nervous transmissions (Action potential (protein channels in the axon…
nervous transmissions
resting potential
when neurone is not transmitting an impulse, the potential difference across its membrane
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The resting potential occurs as a result of the movement of sodium and potassium ions across the axon membrane
the phospholipid bilayer prevents theses ions from diffusing across so they have to use channel proteins
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Action potential
When a stimulus is detected by a sensory receptor, the energy of the stimulus. temporarily reverses the charges on the axon membrane.
As a result the potential difference across the membrane rapidly changes and becomes positively charged at approximately +40mV
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Impulse passes repolarosaton then occurs - a change in potential difference from positive back to negative.
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protein channels in the axon membrane change shape as a result of the change of votage across its membrane
The change in protein shape results in the channel opening or closing. these are known as voltage-gated ion channels.
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