Value of potential possible during conduction of nerve impulse is :-

- 90

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- 70

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+ 20

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+ 70

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Solution

The correct option is B $- 70$ mv
Nearly all cell membranes in animals and plants, they maintain a voltage difference between the exterior and interior of the cell, called the membrane potential. A typical voltage across a cell membrane is -70mV.
So the correct option is "-70mV".

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The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is:
$M (s) | M^{+} (a q; 0.05 m o l a r) | | M^{+} (a q; 1 m o l a r) | M (s)$
For the above electrolytic cell the magnitude of the cell potential $| E_{c e l l} | = 70 m V$ .