Soon after a stimulus is applied at a site on the polarised axonal membrane, which of the following occurs?
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a
The membrane’s permeability to Na+ increases
b
The membrane’s permeability to Na+ decreases
c
The membrane’s permeability to K+ increases
d
The membrane’s permeability to K+ decreases
answer is A.
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Detailed Solution
When a stimulus is applied at a site on the polarised membrane, the membrane at the site A becomes freely permeable to Na+. This leads to a rapid influx of Na+ causing depolarisation.