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Nerve Impulses
Action Potential
1. Depolarisation
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hudson morawiec
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Depolarisation is the sudden
increase
in
membrane
potential.
Depolarisation occurs if the level of
stimulation
exceeds about
15
mV.
Sodium channels allow more
sodium
ions to enter the cell making the
intracellular
fluid less negative, increasing the potential difference.
The
all-or-none
response is where the
size
of the response stays at a constant regardless of the strength of the stimulus.