Question

What is the equilibrium potential of potassium positive ion?

Answer 1

Answer:

✍️Potassium has the REVERSE concentration gradient, hence NEGATIVE equilibrium potential. Chloride has the same INWARD concentration direction as sodium, but because it's a negative charge, it requires a NEGATIVE environment inside the cell to push it OUT. The resting membrane potential of a neuron is about -70mV.

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✍️Take, for example, the equilibrium potentials of potassium and sodium in neurons. The potassium equilibrium potential EK is −84 mV with 5 mM potassium outside and 140 mM inside. On the other hand, the sodium equilibrium potential, ENa, is approximately +66 mV with approximately 12 mM sodium inside and 140 mM outside.

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