The concentration one of the following ion is tenfold higher on the outside of the membrane than inside:
Correct answer: A. Sodium
- A. Sodium
- B. Potassium
- C. Organic ions
- D. All of these
Explanation
Sodium ions are present at a much higher concentration outside the neuron, while potassium is concentrated mainly inside. This sodium gradient is maintained by the sodium-potassium pump and selective membrane permeability.
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