TF12:53 ooo cricket 10. A new form of life is discovered. You are lucky enough t
ID: 167398 • Letter: T
Question
TF12:53 ooo cricket 10. A new form of life is discovered. You are lucky enough to be trusted with a tissue sample. Use the data below to calculate the membrane potential of these cells and select the best answer below. relativemembrane permeability a newly discovered formefline Relative membrane On concentration concentration permeability (mmol/L) mmol/L (conductance) 22 Na+ 29 65 1.0 O 65mV and the inside of the cell is negative (relative to the outside) O 65mV and the inside of the cell is positive (relative to the outside) O +65mV and the inside of the cell is negative (relative to the outside) O 49mv and the inside of the cell is negative (relative to the outside) O +49mV and the inside of the cell is positive (relative to the outside)Explanation / Answer
To find the membrane potential we will simply use Nernest equation
E = RT/ zF ln [ Cout / Cin ]
For each of these ions the values would come out to be -
Na+ = ln [7/22] = -0.49
K+ = ln [29/4] = +0.86
Cl- = ln [9/65] = -0.86
Thus the answer after adding these up would come out to be -0.49 mV.
And the inside of the cell is Positive relative to outside.
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