Assume That a Membrane That Is Permeable to Na⁺ but Not

question 122

Multiple Choice

Assume that a membrane that is permeable to Na⁺ but not to Cl^- separates two solutions. The concentration of sodium chloride on side 1 is much higher than on side 2. Which of the following ionic movements will take place?

• A) Na⁺ will move until its concentration gradient is dissipated (i.e., until the concentration of Na⁺ on side 2 is the same as the concentration of Na⁺ on side 1).
• B) Cl^- will move down its concentration gradient from side 1 to side 2.
• C) a membrane potential, negative on side 1, will develop.
• D) a membrane potential, positive on side 1, will develop.
• E) more than one of these answers.

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