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n what way does the exterior surface of a cell membrane on a resting (non-conducting) neuron...

n what way does the exterior surface of a cell membrane on a resting (non-conducting) neuron differ from the internal environment? The exterior is…

Question 37 options:

negatively charged and contains less sodium

negatively charged and contains more sodium

positively charged and contains more sodium

positively charged and contains less sodium
Science   Anatomy-And-Physiology   
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Answer #1

Option C- positively charged and contains more sodium.

During Resting state of a Neuronal cell membrane-Exterior of the Cell is positively charged.This is due to The presence of positive charged Na+ ions more in the exterior (more Positive ions than Negtaive ions)

Inside Of the cell membrane is negatively charged as it contains more anions like Chloride Ions,It also contains Higher concentration of K+.But conentration of K+ inside the cell is less compared to concentration of Na+ outside the cell.

So when the Na+ channels Open there is Rapid entry of Na+ from exterior to interior of the membrane--which reduces the negative charge inside the neuronal membrane called Depolarisation.

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