Moderate

One of the following ions is twenty times more concentrated inside than outside the membrane surface:

Correct answer: B. Potassium

A. Sodium
B. Potassium
C. Organic ions
D. None of these

Explanation

Potassium ions are much more concentrated inside a resting neuron, roughly twenty to thirty times higher than outside. Sodium shows the opposite pattern, being more concentrated outside the membrane.

Last updated 16 September 2026

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One of the following ions is twenty times more concentrated inside than outside the membrane surface:

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