Given an unusual cell with an intracellular fluid containing 10 mM calcium and an extracellular fluid containing 1 mM calcium. If the cell membrane is permeable only to calcium ions, what is the voltage across the membrane? Assume that the system is at equilibrium and at body temperature.

The correct answer is: -31 mV

Explanation:

Given:

Intracellular fluid concentration = 10 mM

Exracellular fluid concentration = 1 mM

temperature = 237+37 = 310 k

Z = 2

F= 96500 C mol-^1

R = 8.314 J MOL-^1K-^1

Formula -

Ex = (RT/ZF) ln ([x]out/[x]in)

=

= -0.03075447679*1/10 log 10

= - 31 mV

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