a mouse neuron is immersed in a solution during a laboratory experiment at 300k. initially, the concentration of k inside is 10mm and outside the cell is 100mm. what is the nernst potential of potassium at this point

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26-10-2022
Biology

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a mouse neuron is immersed in a solution during a laboratory experiment at 300k. initially, the concentration of k inside is 10mm and outside the cell is 100mm. what is the nernst potential of potassium at this point

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QWpurple QWpurple · Answer 1 · 2022-10-30T14:28:15-04:00

The Nernst potential of potassium at this point is -50 mV.

The Nernst potential for an ion is the potential across the cell membrane that exactly opposes the net diffusion of that ion through the membrane. The ratio between the concentrations of that particular ion on the two sides of the membrane, as seen above, determines the size of the Nernst potential.

The membrane potential at which an ionic species is in equilibrium is known as the Nernst potential.

The interior surface potential will rise after the transfer as the flow of K+ ions rises.

Calculation:

Nernst potential = RT/zF * ln( [K+]out / [K+]in )

Nernst potential = 8.314 J/mol * K * 300 K / (1 * 96485 C/mol) * ln( 100 mM / 10 mM )

Nernst potential = -50 mV

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