Question 33 of 35 Map o Within a cell, potassium ions (K) may move across the 8.

Question

Question 33 of 35 Map o Within a cell, potassium ions (K) may move across the 8.15 nm thick cell membrane from the inside to the outside. Inside the cell, the electric potential is-80.5 mV, whereas it is 0 mV outside the cell. Assuming it is uniform, what is the electric field strength across the membrane? In what direction does the electric field point across the membrane? Electric field strength Electric field direction O O O out of the cell (from inside to outside) parallel to cell membrane into the cell (from outside to inside) Number MV/m

Explanation / Answer

E = delta(V) / d

delta(V) = 80.5 mV = 80.5 x 10^-3 Volt

E = (80.5 x 10^-3) / (8.15 x 10^-9 m)

E = 9.88 x 10^6 V/m

Ans: 9.88 MV/m

direction-> high potential to lower potential.

Ans: into the cell

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