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Consider a hypothetical cell whose plasma membrane is impermeant to everything. The membrane is studded with...

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Medical Sciences

Consider a hypothetical cell whose plasma membrane is impermeantto everything. The membrane is studded with channel proteins forCa2+, but these channels are initially closed. The concentration ofCa2+ outside the cell is 100 mM and the concentration of Ca2+inside the cell is 1 mM. Initally, the membrane potential is 0mV.

After a while, the net flow of Ca2+ ceases because dynamicequilibrium has been reached. What is the membrane potential of thecell when it reaches dynamic equilibrium? Show how you arrived atthis answer.

Answer & Explanation Solved by verified expert
4.3 Ratings (527 Votes)
When thermodynamic equilibrium has been achieved there is nomore net flux of ions the resting membrane potential becomesequal to Nernst potential which can be calculated using the Nernstequation formulawhere E is the membrane potential R    See Answer
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