The Electric Potential inside a typical cell is usually about 80[mV] more negati

Question

The Electric Potential inside a typical cell is usually about 80[mV] more negative than the outside ; the difference occurs within the cell membrane (thickness 100[nm]). How much Energy is released/required while a Na+ ion moves from inside to outside the cell?

a. 0.080 [eV] required
b. 0.080 [eV] released
c. 800,000 [eV] required
d. 800,000 [eV] released
e. 5.0 × 1017 [eV] required
f. 5.0 × 1017 [eV] released
g. none of these ; a really small amount would be required
h. none of the others ; a really small amount would be

Explanation / Answer

Potential difference between inside and outside of the cell V = 80 mV                                                                                               = 0.08 V i.e., inside potential is low than outside Charge of Na + ion q = 1.6 x 10 -19 C Energy required E = V x q                             = 1.28 x 10 -20 J                             = ( 1.28 x 10 - 20) / ( 1.6 x 10 -19 ) eV                             = 0.08 eV

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