Item 6 Constants Part A A 8.9-nm-thick cell membrane undergoes an action potenti

Question

Item 6 Constants Part A A 8.9-nm-thick cell membrane undergoes an action potential that follows the curve in (Figure 1) What is the strength of the electric field inside the membrane just before the action potential? You may want to review (Pages 746 -752) Express your answer to two significant figures and include the appropriate units EValue Units Submit Request Answer Part B What is the strength of the electric field inside the membrane at the peak of the depolarization? Express your answer to two significant figures and include the appropriate units EValue Units Submit Request Answer Provide FeedbacK Figure 1 of 1 > membrane (m V) +40 t (ms) 0 23 70

Explanation / Answer

a)

given, thickness of cell membrane, t = 8.9 nm = 8.9 * 10-9 m ,

So, eletric potential just before action, V = 70 mV = 70 * 10-3 V

so, Electric field inside membrane just before action, E = V/t

= 70 * 10-3/ (8.9 * 10-9) = 7.865 * 106 V/m(or N/C)

b)

At the point of the depolarisation, Peak voltage, V = 40 mV = 40 * 10-3 V

so, electric field, E at this point, Ep = V/t

= 40 * 10-3 / (8.9 * 10-9) = 4.494 * 106 V/m(or N/C )

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